image image	question string	choices sequence	answer int8	hint string	task string	grade string	subject string	topic string	category string	skill string	lecture string	solution string
	"Which of these states is farthest north?"	[ "West Virginia", "Louisiana", "Arizona", "Oklahoma" ]	0	""	"closed choice"	"grade2"	"social science"	"geography"	"Geography"	"Read a map: cardinal directions"	"Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map."	"To find the answer, look at the compass rose. Look at which way the north arrow is pointing. West Virginia is farthest north."
	"Identify the question that Tom and Justin's experiment can best answer."	[ "Do ping pong balls stop rolling along the ground sooner after being launched from a 30° angle or a 45° angle?", "Do ping pong balls travel farther when launched from a 30° angle compared to a 45° angle?" ]	1	"The passage below describes an experiment. Read the passage and then follow the instructions below. Tom placed a ping pong ball in a catapult, pulled the catapult's arm back to a 45° angle, and launched the ball. Then, Tom launched another ping pong ball, this time pulling the catapult's arm back to a 30° angle. With each launch, his friend Justin measured the distance between the catapult and the place where the ball hit the ground. Tom and Justin repeated the launches with ping pong balls in four more identical catapults. They compared the distances the balls traveled when launched from a 45° angle to the distances the balls traveled when launched from a 30° angle. Figure: a catapult for launching ping pong balls."	"closed choice"	"grade8"	"natural science"	"science-and-engineering-practices"	"Designing experiments"	"Identify the experimental question"	"Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment. Imagine an experiment with two groups of daffodil plants. One group of plants was grown in sandy soil, and the other was grown in clay soil. Then, the height of each plant was measured. First, identify the part of the experiment that was tested. The part of an experiment that is tested usually involves the part of the experimental setup that is different or changed. In the experiment described above, each group of plants was grown in a different type of soil. So, the effect of growing plants in different soil types was tested. Then, identify the part of the experiment that was measured. The part of the experiment that is measured may include measurements and calculations. In the experiment described above, the heights of the plants in each group were measured. Experiments can answer questions about how the part of the experiment that is tested affects the part that is measured. So, the experiment described above can answer questions about how soil type affects plant height. Examples of questions that this experiment can answer include: Does soil type affect the height of daffodil plants? Do daffodil plants in sandy soil grow taller than daffodil plants in clay soil? Are daffodil plants grown in sandy soil shorter than daffodil plants grown in clay soil?"	""
	"Identify the question that Kathleen and Bryant's experiment can best answer."	[ "Does Kathleen's snowboard slide down a hill in less time when it has a layer of wax or when it does not have a layer of wax?", "Does Kathleen's snowboard slide down a hill in less time when it has a thin layer of wax or a thick layer of wax?" ]	0	"The passage below describes an experiment. Read the passage and then follow the instructions below. Kathleen applied a thin layer of wax to the underside of her snowboard and rode the board straight down a hill. Then, she removed the wax and rode the snowboard straight down the hill again. She repeated the rides four more times, alternating whether she rode with a thin layer of wax on the board or not. Her friend Bryant timed each ride. Kathleen and Bryant calculated the average time it took to slide straight down the hill on the snowboard with wax compared to the average time on the snowboard without wax. Figure: snowboarding down a hill."	"closed choice"	"grade7"	"natural science"	"science-and-engineering-practices"	"Designing experiments"	"Identify the experimental question"	"Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment. Imagine an experiment with two groups of daffodil plants. One group of plants was grown in sandy soil, and the other was grown in clay soil. Then, the height of each plant was measured. First, identify the part of the experiment that was tested. The part of an experiment that is tested usually involves the part of the experimental setup that is different or changed. In the experiment described above, each group of plants was grown in a different type of soil. So, the effect of growing plants in different soil types was tested. Then, identify the part of the experiment that was measured. The part of the experiment that is measured may include measurements and calculations. In the experiment described above, the heights of the plants in each group were measured. Experiments can answer questions about how the part of the experiment that is tested affects the part that is measured. So, the experiment described above can answer questions about how soil type affects plant height. Examples of questions that this experiment can answer include: Does soil type affect the height of daffodil plants? Do daffodil plants in sandy soil grow taller than daffodil plants in clay soil? Are daffodil plants grown in sandy soil shorter than daffodil plants grown in clay soil?"	""
Not supported with pagination yet	"Which tense does the sentence use? Mona will print her name with care."	[ "present tense", "future tense", "past tense" ]	1	""	"closed choice"	"grade2"	"language science"	"verbs"	"Verb tense"	"Is the sentence in the past, present, or future tense?"	"Present tense verbs tell you about something that is happening now. Most present-tense verbs are regular. They have no ending, or they end in -s or -es. Two verbs are irregular in the present tense, to be and to have. You must remember their forms. Past tense verbs tell you about something that has already happened. Most past-tense verbs are regular. They end in -ed. Some verbs are irregular in the past tense. You must remember their past-tense forms. Future tense verbs tell you about something that is going to happen. All future-tense verbs use the word will. Present \| Past \| Future walk, walks \| walked \| will walk go, goes \| went \| will go"	"The sentence is in future tense. You can tell because it uses will before the main verb, print. The verb tells you about something that is going to happen."
Not supported with pagination yet	"Complete the sentence. Sewing an apron is a ()."	[ "chemical change", "physical change" ]	1	""	"closed choice"	"grade4"	"natural science"	"chemistry"	"Physical and chemical change"	"Identify physical and chemical changes"	"Chemical changes and physical changes are two common ways matter can change. In a chemical change, the type of matter changes. The types of matter before and after a chemical change are always different. Burning a piece of paper is a chemical change. When paper gets hot enough, it reacts with oxygen in the air and burns. The paper and oxygen change into ash and smoke. In a physical change, the type of matter stays the same. The types of matter before and after a physical change are always the same. Cutting a piece of paper is a physical change. The cut pieces are still made of paper. A change of state is a type of physical change. For example, ice melting is a physical change. Ice and liquid water are made of the same type of matter: water."	"Sewing an apron is a physical change. The fabric and thread that make up the apron get a new shape, but the type of matter in each of them does not change."
Not supported with pagination yet	"Which of the following contains a vague pronoun reference?"	[ "Steven's brother Jim wondered whether he ran fast enough to qualify for the Boston Marathon.", "Steven's brother Jim wondered whether Steven ran fast enough to qualify for the Boston Marathon." ]	0	""	"closed choice"	"grade11"	"language science"	"writing-strategies"	"Pronouns"	"Identify vague pronoun references"	"When writing, make sure to avoid vague pronoun references. A vague pronoun reference occurs when a pronoun could refer to more than one possible antecedent. When Lisa and Kim finally landed, she breathed a sigh of relief. The pronoun she could refer to either Lisa or Kim, so the meaning of the sentence is unclear. Vague pronoun references can be corrected in one of two ways: 1. Replace the pronoun with its correct antecedent: When Lisa and Kim finally landed, Lisa breathed a sigh of relief. 2. Rewrite the sentence: Lisa breathed a sigh of relief when she and Kim finally landed. A vague pronoun reference also occurs when they, them, their, theirs, it, or its is used without its antecedent. They say that this nail polish dries in less than five minutes. The pronoun they is used without its antecedent, so the meaning of the sentence is unclear. This problem can be fixed by replacing the pronoun with its missing antecedent. The advertisements say that this nail polish dries in less than five minutes."	"The first answer choice contains a vague pronoun reference. The pronoun he could refer to Steven or Jim. The second answer choice shows a possible correction for the vague pronoun reference. He has been replaced with Steven. Steven's brother Jim wondered whether Steven ran fast enough to qualify for the Boston Marathon."
	"What is the probability that a goat produced by this cross will be homozygous dominant for the myotonia congenita gene?"	[ "1/4", "0/4", "4/4", "2/4", "3/4" ]	0	"This passage describes the myotonia congenita trait in goats: Myotonia congenita is a condition that causes temporary muscle stiffness. When goats with myotonia congenita attempt to run from a resting position, their leg muscles often stiffen, causing them to fall over. Because of this behavior, these goats are referred to as fainting goats. Myotonia congenita is also found in other mammals, including horses, cats, and humans. In a group of goats, some individuals have myotonia congenita and others do not. In this group, the gene for the myotonia congenita trait has two alleles. The allele for having myotonia congenita (M) is dominant over the allele for not having myotonia congenita (m). This Punnett square shows a cross between two goats."	"closed choice"	"grade8"	"natural science"	"biology"	"Genes to traits"	"Use Punnett squares to calculate probabilities of offspring types"	"Offspring genotypes: homozygous or heterozygous? How do you determine whether an organism is homozygous or heterozygous for a gene? Look at the alleles in the organism's genotype for that gene. An organism with two identical alleles for a gene is homozygous for that gene. If both alleles are dominant, the organism is homozygous dominant for the gene. If both alleles are recessive, the organism is homozygous recessive for the gene. An organism with two different alleles for a gene is heterozygous for that gene. In a Punnett square, each box represents a different outcome, or result. Each of the four outcomes is equally likely to happen. Each box represents one way the parents' alleles can combine to form an offspring's genotype. Because there are four boxes in the Punnett square, there are four possible outcomes. An event is a set of one or more outcomes. The probability of an event is a measure of how likely the event is to happen. This probability is a number between 0 and 1, and it can be written as a fraction: probability of an event = number of ways the event can happen / number of equally likely outcomes You can use a Punnett square to calculate the probability that a cross will produce certain offspring. For example, the Punnett square below has two boxes with the genotype Ff. It has one box with the genotype FF and one box with the genotype ff. This means there are two ways the parents' alleles can combine to form Ff. There is one way they can combine to form FF and one way they can combine to form ff. \| F \| f F \| FF \| Ff f \| Ff \| ff Consider an event in which this cross produces an offspring with the genotype ff. The probability of this event is given by the following fraction: number of ways the event can happen / number of equally likely outcomes = number of boxes with the genotype ff / total number of boxes = 1 / 4"	""
	"Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature?"	[ "neither; the samples have the same temperature", "sample A", "sample B" ]	2	"The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles."	"closed choice"	"grade8"	"natural science"	"physics"	"Particle motion and energy"	"Identify how particle motion affects temperature and pressure"	"The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance. The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of each particle in the substance and the higher the average speed of the particles, the higher their average kinetic energy."	"The particles in both samples have the same average speed, but each particle in sample B has more mass than each particle in sample A. So, the particles in sample B have a higher average kinetic energy than the particles in sample A. Because the particles in sample B have the higher average kinetic energy, sample B must have the higher temperature."
Not supported with pagination yet	"What do these two changes have in common? tearing a piece of paper breaking a piece of glass"	[ "Both are only physical changes.", "Both are chemical changes.", "Both are caused by cooling.", "Both are caused by heating." ]	0	""	"closed choice"	"grade4"	"natural science"	"chemistry"	"Physical and chemical change"	"Compare physical and chemical changes"	"Chemical changes and physical changes are two common ways matter can change. In a chemical change, the type of matter changes. The types of matter before and after a chemical change are always different. Some chemical changes are caused by heating or cooling. For example, burning a piece of paper is a chemical change caused by heating. When paper gets hot enough, it reacts with oxygen in the air and burns. The paper and oxygen change into ash and smoke. In a physical change, the type of matter stays the same. The types of matter before and after a physical change are always the same. A change of state is a type of physical change. Changes of state can be caused by heating or cooling. For example, ice melting is a physical change that can be caused by heating. Ice and liquid water are made of the same type of matter: water. The law of conservation of mass says that all physical and chemical changes conserve mass. Conserve means to keep the same. So, the total mass before a physical or chemical change is equal to the total mass after the change."	"Step 1: Think about each change. Tearing a piece of paper is a physical change. The paper tears into pieces. But each piece is still made of paper. Breaking a piece of glass is a physical change. The glass gets broken into pieces. But each piece is still made of the same type of matter. Step 2: Look at each answer choice. Both are only physical changes. Both changes are physical changes. No new matter is created. Both are chemical changes. Both changes are physical changes. They are not chemical changes. Both are caused by heating. Neither change is caused by heating. Both are caused by cooling. Neither change is caused by cooling."
	"Which of these organisms contains matter that was once part of the phytoplankton?"	[ "black rockfish", "sea otter" ]	0	"Below is a food web from an ocean ecosystem in Monterey Bay, off the coast of California. A food web models how the matter eaten by organisms moves through an ecosystem. The arrows in a food web represent how matter moves between organisms in an ecosystem."	"closed choice"	"grade6"	"natural science"	"biology"	"Ecological interactions"	"Interpret food webs II"	"A food web is a model. A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web shows how some organisms in an ecosystem can get their food. Arrows show how matter moves. A food web has arrows that point from one organism to another. Each arrow shows the direction that matter moves when one organism eats another organism. An arrow starts from the organism that is eaten. The arrow points to the organism that is doing the eating. An organism in a food web can have more than one arrow pointing from it. This shows that the organism is eaten by more than one other organism in the food web. An organism in a food web can also have more than one arrow pointing to it. This shows that the organism eats more than one other organism in the food web."	"Use the arrows to follow how matter moves through this food web. For each answer choice, try to find a path of arrows that starts from the phytoplankton. The only arrow pointing to the sea otter starts from the sea urchin. The only arrow pointing to the sea urchin starts from the kelp. No arrow points to the kelp. So, in this food web, matter does not move from the phytoplankton to the sea otter.There are two paths matter can take from the phytoplankton to the plainfin midshipman: phytoplankton->plainfin midshipman. phytoplankton->zooplankton->plainfin midshipman. There is one path matter can take from the phytoplankton to the black rockfish: phytoplankton->zooplankton->black rockfish. There is one path matter can take from the phytoplankton to the zooplankton: phytoplankton->zooplankton."
	"Which solution has a higher concentration of blue particles?"	[ "neither; their concentrations are the same", "Solution B", "Solution A" ]	0	"The diagram below is a model of two solutions. Each blue ball represents one particle of solute."	"closed choice"	"grade8"	"natural science"	"chemistry"	"Solutions"	"Compare concentrations of solutions"	"A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent"	"In Solution A and Solution B, the blue particles represent the solute. To figure out which solution has a higher concentration of blue particles, look at both the number of blue particles and the volume of the solvent in each container. Use the concentration formula to find the number of blue particles per milliliter. Solution A and Solution B have the same number of blue particles per milliliter. So, their concentrations are the same."
	"Think about the magnetic force between the magnets in each pair. Which of the following statements is true?"	[ "The strength of the magnetic force is the same in both pairs.", "The magnetic force is stronger in Pair 2.", "The magnetic force is stronger in Pair 1." ]	2	"The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material."	"closed choice"	"grade3"	"natural science"	"physics"	"Magnets"	"Compare strengths of magnetic forces"	"Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the strength of a magnetic force between two magnets by changing the distance between them. The magnetic force is stronger when the magnets are closer together."	"Distance affects the strength of the magnetic force. When magnets are closer together, the magnetic force between them is stronger. The magnets in Pair 1 are closer together than the magnets in Pair 2. So, the magnetic force is stronger in Pair 1 than in Pair 2."
Not supported with pagination yet	"What is the volume of a large soup pot?"	[ "7 liters", "7 milliliters" ]	0	"Select the better estimate."	"closed choice"	"grade5"	"natural science"	"units-and-measurement"	"Units and measurement"	"Choose metric units of volume"	"Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. Volume is a measurement of how much space something takes up. There are many different units of volume. When you are using metric units, volume may be written in units of milliliters or liters. There are 1,000 milliliters in 1 liter. So, 1 milliliter is much less than 1 liter. A raindrop has a volume of about 20 milliliters, while a large soda bottle has a volume of 2 liters. The flask shown here measures volumes up to 500 milliliters."	"The better estimate for the volume of a large soup pot is 7 liters. 7 milliliters is too little."
	"What does pollen help a plant do?"	[ "make seeds", "grow bigger", "grow new leaves" ]	0	"The male part of a flower makes pollen."	"closed choice"	"grade4"	"natural science"	"biology"	"Plants"	"Describe and construct flowering plant life cycles"	"Many plants have flowers. These plants can use their flowers to reproduce, or make new plants like themselves. How do plants use their flowers to reproduce? First, the male part of the flower makes pollen, and the female part makes eggs. Animals, wind, or water can move pollen. Pollination is what happens when pollen is moved to the female part of the flower. After pollination, sperm from the pollen can combine with the eggs. This is called fertilization. The fertilized eggs grow into seeds. The fruit grows around the seeds. Later, a seed can fall out of the fruit. It can germinate, or start to grow into a new plant."	"Pollen helps the flower make seeds. After pollination, sperm cells from the pollen can combine with the eggs. These fertilized eggs can grow into seeds. Pollen does not help a plant grow bigger or grow leaves."
Not supported with pagination yet	"Read the following excerpt from a student essay. How can the writer best improve his or her word choice? When I said that I wanted to take a cooking class, I didn't know what I was getting into. I love cooking, but I'm very shy and hate being in the spotlight. The first time the teacher asked me to do a culinary technique, my hands were sweating profusely. As I held the heavy utility knife in my sweaty hand, it fell to the floor. The class had just started, and I had already made a terrible first impression! My face was red, but I got the knife, put it in the sink, took a clean one, and cut the slab of raw bluefin tuna into paper-thin pieces. Everyone in the class—even the instructor—gave me a round of applause."	[ "by adding technical terms", "by using more precise verbs", "by using words with more appropriate connotations" ]	1	""	"closed choice"	"grade11"	"language science"	"writing-strategies"	"Editing and revising"	"Suggest appropriate revisions"	"During peer review, you read and respond to a fellow student's writing. While there are many methods and strategies that you can use for reviewing a text, it is generally helpful to frame your suggestions in concrete and constructive ways and to consider the following areas for revision: Ideas and development: Does the writer express a clear idea and develop it with evidence, examples, or analysis? Organization: Does the writer order ideas in a clear, logical way so that they build on one another and are easy to follow? Voice: Does the writer maintain an appropriate voice, such as a formal and objective voice in an academic essay or an engaging and expressive voice in a narrative essay? Sentence fluency: Does the writer use sentences that vary in structure and length to create a sense of rhythm and flow within and between sentences, or does the writing sound choppy, rambling, or repetitive? Word choice: Does the writer use words accurately and precisely to create clear, effective, and engaging writing? Grammar and mechanics: Does the writer follow appropriate conventions, using accurate spelling, punctuation, and grammar to create writing that is correct and easy to read?"	"The writer could best improve his or her word choice by using more precise verbs. For example, the writer could replace the underlined words with verbs such as announced, realize, adore, abhor, demonstrate, gripped, clanged, retrieved, deposited, selected, and sliced. When I said that I wanted to take a cooking class, I didn't know what I was getting into. I love cooking, but I'm very shy and hate being in the spotlight. The first time the teacher asked me to do a culinary technique, my hands were sweating profusely. As I held the heavy utility knife in my sweaty hand, it fell to the floor. The class had just started, and I had already made a terrible first impression! My face was red, but I got the knife, put it in the sink, took a clean one, and cut the slab of raw bluefin tuna into paper-thin pieces. Everyone in the class—even the instructor—gave me a round of applause."
Not supported with pagination yet	"What information supports the conclusion that Logan inherited this trait?"	[ "Logan's mother has blue eyes. She passed this trait down to Logan.", "Logan likes to wear a blue sweater to match his blue eyes." ]	0	"Read the description of a trait. Logan has blue eyes."	"closed choice"	"grade4"	"natural science"	"biology"	"Traits and heredity"	"Inherited and acquired traits: use evidence to support a statement"	"Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment."	""
	"Which property matches this object?"	[ "flexible", "sticky" ]	0	"Select the better answer."	"closed choice"	"grade3"	"natural science"	"physics"	"Materials"	"Identify properties of an object"	"An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it."	"Look at the object. Think about each property. A flexible object can be folded or bent without breaking easily. The helium balloons are flexible. A sticky object can attach or stick to other things. The helium balloons are not sticky."
	"What is the capital of South Carolina?"	[ "Columbia", "Montgomery", "Charleston", "Harrisburg" ]	0	""	"closed choice"	"grade3"	"social science"	"geography"	"State capitals"	"Identify state capitals of the Southeast"	""	"Columbia is the capital of South Carolina."
Not supported with pagination yet	"Is the following trait inherited or acquired? Katy plays soccer."	[ "inherited", "acquired" ]	1	"Hint: Playing soccer takes practice."	"closed choice"	"grade3"	"natural science"	"biology"	"Heredity"	"Identify inherited and acquired traits"	"Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Children do not inherit their parents' acquired traits."	"People are not born knowing how to play soccer. Instead, some people learn how to play soccer. Playing the sport takes practice. So, playing soccer is an acquired trait."
Not supported with pagination yet	"Based on this information, what is Holly's phenotype for the whisker type trait?"	[ "straight whiskers", "curved whiskers" ]	0	"In a group of Syrian hamsters, some individuals have straight whiskers and others have curved whiskers. In this group, the gene for the whisker type trait has two alleles. The allele for curved whiskers (h) is recessive to the allele for straight whiskers (H). Holly is a Syrian hamster from this group. Holly has the heterozygous genotype Hh for the whisker type gene."	"closed choice"	"grade8"	"natural science"	"biology"	"Genes to traits"	"Genetics vocabulary: dominant and recessive"	"All organisms have pieces of hereditary material called genes, which are passed from parents to offspring. Genes contain instructions for building the parts of an organism. An organism's genes affect its observable traits, including its appearance, its behavior, and which diseases it may have. Genes may have different alleles, or forms, that can cause different versions of a trait. For example, flower color is a trait in pea plants. The gene for this trait has two possible alleles. Each allele is represented by an uppercase or lowercase letter. The allele F is for purple flowers, and the allele f is for white flowers. Each pea plant has two alleles for the flower color gene—one allele inherited from each parent. An organism's genotype for a gene is its combination of alleles for that gene. So, a pea plant may have a genotype of FF, Ff, or ff for the flower color gene. An organism's phenotype for a trait is its observable version of that trait, which depends on the organism's combination of alleles. A pea plant may have a phenotype of purple flowers or white flowers for the flower color trait. Some traits, like flower color in pea plants, are controlled by a single gene. Most plants and animals have a genotype made up of two alleles for these traits. These two alleles determine whether an organism is homozygous or heterozygous for the gene. An organism with two identical alleles for a gene is homozygous for that gene. A pea plant with the genotype FF or ff is homozygous for the flower color gene. An organism with two different alleles for a gene is heterozygous for that gene. A pea plant with the genotype Ff is heterozygous for the flower color gene. The types of alleles in an organism's genotype determine the organism's phenotype. Some alleles have types called dominant and recessive. These two types can cause different versions of a trait to appear as the organism's phenotype. A dominant allele causes its version of the trait to appear even when the organism also has a recessive allele for the gene. In pea plants, the F allele, which causes purple flowers, is dominant over the f allele. A pea plant with at least one F allele will have the F allele's version of the flower color trait. So, a plant with the genotype FF or Ff will have purple flowers. A recessive allele causes its version of the trait to appear only when the organism does not have any dominant alleles for the gene. In pea plants, the f allele, which causes white flowers, is recessive to the F allele. A pea plant with only f alleles will have the f allele's version of the flower color trait. So, a plant with the genotype ff will have white flowers."	"You need to determine Holly's phenotype for the whisker type trait. First, consider the alleles in Holly's genotype for the whisker type gene. Then, decide whether these alleles are dominant or recessive. The allele for curved whiskers (h) is recessive to the allele for straight whiskers (H). This means H is a dominant allele, and h is a recessive allele. Holly's genotype of Hh has one dominant allele and one recessive allele. An organism with at least one dominant allele for a gene will have the dominant allele's version of the trait. So, Holly's phenotype for the whisker type trait must be straight whiskers."
Not supported with pagination yet	"Select the solid."	[ "rain", "water in a fishbowl", "hammer" ]	2	""	"closed choice"	"grade2"	"natural science"	"physics"	"States of matter"	"Identify solids and liquids"	"Solid and liquid are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms. When matter is a solid, it has a shape of its own. Some solids can be bent or broken easily. Others are hard to bend or break. A glass cup is a solid. A sock is also a solid. When matter is a liquid, it takes the shape of its container. Think about pouring a liquid from a cup into a bottle. The shape of the liquid is different in the cup than in the bottle. But the liquid still takes up the same amount of space. Juice is a liquid. Honey is also a liquid."	""
	"What is the probability that a koi fish produced by this cross will have black eyes?"	[ "0/4", "1/4", "4/4", "3/4", "2/4" ]	0	"In a group of koi fish, some individuals have red eyes and others have black eyes. In this group, the gene for the eye color trait has two alleles. The allele for red eyes (E) is dominant over the allele for black eyes (e). This Punnett square shows a cross between two koi fish."	"closed choice"	"grade8"	"natural science"	"biology"	"Genes to traits"	"Use Punnett squares to calculate probabilities of offspring types"	"Offspring phenotypes: dominant or recessive? How do you determine an organism's phenotype for a trait? Look at the combination of alleles in the organism's genotype for the gene that affects that trait. Some alleles have types called dominant and recessive. These two types can cause different versions of the trait to appear as the organism's phenotype. If an organism's genotype has at least one dominant allele for a gene, the organism's phenotype will be the dominant allele's version of the gene's trait. If an organism's genotype has only recessive alleles for a gene, the organism's phenotype will be the recessive allele's version of the gene's trait. In a Punnett square, each box represents a different outcome, or result. Each of the four outcomes is equally likely to happen. Each box represents one way the parents' alleles can combine to form an offspring's genotype. Because there are four boxes in the Punnett square, there are four possible outcomes. An event is a set of one or more outcomes. The probability of an event is a measure of how likely the event is to happen. This probability is a number between 0 and 1, and it can be written as a fraction: probability of an event = number of ways the event can happen / number of equally likely outcomes You can use a Punnett square to calculate the probability that a cross will produce certain offspring. For example, the Punnett square below has two boxes with the genotype Ff. It has one box with the genotype FF and one box with the genotype ff. This means there are two ways the parents' alleles can combine to form Ff. There is one way they can combine to form FF and one way they can combine to form ff. \| F \| f F \| FF \| Ff f \| Ff \| ff Consider an event in which this cross produces an offspring with the genotype ff. The probability of this event is given by the following fraction: number of ways the event can happen / number of equally likely outcomes = number of boxes with the genotype ff / total number of boxes = 1 / 4."	""
Not supported with pagination yet	"Which figure of speech is used in this text? Hunter remarked that the new book on anti-gravity was impossible to put down."	[ "alliteration", "pun" ]	1	""	"closed choice"	"grade9"	"language science"	"figurative-language"	"Literary devices"	"Classify figures of speech: review"	"Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive. Alliteration is the repetition of sounds at the beginning of nearby words. What a lucky little lady you are! An allusion is a brief reference to something or someone well known, often from history or literature. "I'd better get home before I turn into a pumpkin!" Lila remarked. An idiom is an expression that cannot be understood literally. Its meaning must be learned. The assignment was a piece of cake. A simile uses like or as to compare two things that are not actually alike. The cat's fur was as dark as the night. A metaphor compares two things that are not actually alike without using like or as. The snow formed a blanket over the town. Onomatopoeia involves using a word that expresses a sound. The scrambled eggs hit the floor with a splat. Personification is giving human characteristics to nonhuman things. The trees danced in the wind. A pun involves using a word or phrase in a humorous way that suggests more than one meaning. A great new broom is sweeping the nation. Verbal irony involves saying one thing but implying something very different. People often use verbal irony when they are being sarcastic. Olivia seems thrilled that her car keeps breaking down. Each breakdown is as enjoyable as a punch to the face."	"The text uses a pun, a word or phrase that humorously suggests more than one meaning. Impossible to put down means that the book is so good that it is hard to stop reading. The phrase impossible to put down is also a joke about anti-gravity: if gravity pulls things down, perhaps anti-gravity does the opposite and makes them impossible to put down."
	"Which property do these three objects have in common?"	[ "hard", "soft", "yellow" ]	1	"Select the best answer."	"closed choice"	"grade4"	"natural science"	"physics"	"Materials"	"Compare properties of objects"	"An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification."	"Look at each object. For each object, decide if it has that property. A hard object does not change shape when pressed or squeezed. None of the objects are hard. Yellow is a color. This color is yellow. None of the objects are yellow. A soft object changes shape when pressed or squeezed. All three objects are soft. The property that all three objects have in common is soft."
Not supported with pagination yet	"What information supports the conclusion that Aaron acquired this trait?"	[ "Aaron is most interested in plant biology.", "Aaron learned biology by doing experiments." ]	1	"Read the description of a trait. Aaron knows a lot about biology."	"closed choice"	"grade3"	"natural science"	"biology"	"Heredity"	"Inherited and acquired traits: use evidence to support a statement"	"Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment."	""
	"What is the capital of Colorado?"	[ "Baton Rouge", "Denver", "Sacramento", "Spokane" ]	1	""	"closed choice"	"grade5"	"social science"	"geography"	"State capitals"	"Identify the 50 state capitals"	""	"Denver is the capital of Colorado."
	"Select the fish below."	[ "black howler", "cardinalfish" ]	1	"Fish live underwater. They have fins, not limbs. A tiger shark is an example of a fish."	"closed choice"	"grade3"	"natural science"	"biology"	"Classification"	"Identify mammals, birds, fish, reptiles, and amphibians"	"Birds, mammals, fish, reptiles, and amphibians are groups of animals. The animals in each group have traits in common. Scientists sort animals into groups based on traits they have in common. This process is called classification."	"A cardinalfish is a fish. It lives underwater. It has fins, not limbs. Cardinalfish often live near coral reefs. They are nocturnal, which means that they are active mostly at night. A black howler is a mammal. It has hair and feeds its young milk. Howler monkeys have loud calls, or howls. Their calls can be heard over three miles away!"
Not supported with pagination yet	"How long is a guitar?"	[ "1 centimeter", "1 meter", "1 kilometer", "1 millimeter" ]	1	"Select the best estimate."	"closed choice"	"grade7"	"natural science"	"units-and-measurement"	"Units and measurement"	"Choose metric units of distance, mass, and volume"	"Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. When you are using metric units, length can be written with units of millimeters, centimeters, meters, or kilometers. One meter contains 100 centimeters or 1,000 millimeters. So, 1 meter is larger than 1 centimeter, and 1 centimeter is larger than 1 millimeter. The tip of the pencil shown here is only 1 millimeter wide, but the pencil is about 16 centimeters long. A red fox is about 1 meter long. The Sydney Harbour Bridge in Australia is about 1,000 meters, or 1 kilometer, in length."	"The best estimate for the length of a guitar is 1 meter. 1 millimeter and 1 centimeter are too short. 1 kilometer is too long."
	"Complete the statement. Tungsten carbide is ()."	[ "an elementary substance", "a compound" ]	1	"The model below represents tungsten carbide. Tungsten carbide can be used to make the tips of ballpoint pens."	"closed choice"	"grade7"	"natural science"	"chemistry"	"Atoms and molecules"	"Classify elementary substances and compounds using models"	"There are more than 100 different chemical elements, or types of atoms. Chemical elements make up all of the substances around you. A substance may be composed of one chemical element or multiple chemical elements. Substances that are composed of only one chemical element are elementary substances. Substances that are composed of multiple chemical elements bonded together are compounds. Every chemical element is represented by its own atomic symbol. An atomic symbol may consist of one capital letter, or it may consist of a capital letter followed by a lowercase letter. For example, the atomic symbol for the chemical element fluorine is F, and the atomic symbol for the chemical element beryllium is Be. Scientists use different types of models to represent substances whose atoms are bonded in different ways. One type of model is a ball-and-stick model. The ball-and-stick model below represents the compound pyrite. In a ball-and-stick model, the balls represent atoms, and the sticks represent bonds. Notice that the balls in the model above are not all the same color. Each color represents a different chemical element. The legend shows the color and the atomic symbol for each chemical element in the substance."	"Use the model to determine whether tungsten carbide is an elementary substance or a compound. Step 1: Interpret the model. . Use the legend to determine the chemical element represented by each color. The colors and atomic symbols from the legend are shown in the table below. The table also includes the names of the chemical elements represented in the model. You can see from the model that tungsten carbide is composed of carbon atoms and tungsten atoms bonded together. Step 2: Determine whether the substance is an elementary substance or a compound. You know from Step 1 that tungsten carbide is composed of two chemical elements: carbon and tungsten. Since tungsten carbide is composed of multiple chemical elements bonded together, tungsten carbide is a compound."
	"What can Maureen and Kendrick trade to each get what they want?"	[ "Kendrick can trade his broccoli for Maureen's oranges.", "Kendrick can trade his almonds for Maureen's tomatoes.", "Maureen can trade her tomatoes for Kendrick's broccoli.", "Maureen can trade her tomatoes for Kendrick's carrots." ]	2	"Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another. Maureen and Kendrick open their lunch boxes in the school cafeteria. Neither Maureen nor Kendrick got everything that they wanted. The table below shows which items they each wanted: Look at the images of their lunches. Then answer the question below. Maureen's lunch Kendrick's lunch"	"closed choice"	"grade8"	"social science"	"economics"	"Basic economic principles"	"Trade and specialization"	""	"Look at the table and images. Maureen wants broccoli. Kendrick wants tomatoes. They can trade tomatoes for broccoli to both get what they want. Trading other things would not help both people get more items they want."
Not supported with pagination yet	"Select the living thing."	[ "teddy bear", "amoebae", "van", "kite" ]	1	""	"closed choice"	"grade4"	"natural science"	"biology"	"Classification"	"Identify living and nonliving things"	"All living things are made up of cells. Plants, animals, and some fungi have many cells. Other living things are made up of just one cell. All living things need food and water. Water helps living things break down food and remove waste. Food gives living things energy. They use energy from food to grow and change. All living things sense changes in their environment. Living things might sense changes by seeing, smelling, hearing, or feeling. Living things can respond to the changes they sense."	"A teddy bear is not a living thing. Teddy bears do not have all of the traits of living things. They do not grow or respond to their environment. They do not need food or water. A kite is not a living thing. A kite does not have all the traits of a living thing. It moves fast in the wind, but it does not grow. It does not need food or water. A van is not a living thing. A van does not have all the traits of a living thing. Vans need energy, but they do not eat food. They get energy from gasoline or electricity. Vans do not grow. Amoebae are living things. Amoebae grow and respond to their environment. They need food and water. Amoebae are made up of just one cell. Amoebae live in fresh water, in salt water, and in the soil."
Not supported with pagination yet	"Which organ controls the function of other body organs?"	[ "skeleton", "lungs", "heart", "brain" ]	3	""	"closed choice"	"grade5"	"natural science"	"biology"	"Animals"	"Human organs and their functions"	""	""
	"What is the expected ratio of offspring with a hairy body to offspring with a hairless body? Choose the most likely ratio."	[ "3:1", "4:0", "2:2", "0:4", "1:3" ]	1	"In a group of deer mice, some individuals have a hairy body and others have a hairless body. In this group, the gene for the body hair trait has two alleles. The allele for a hairy body (B) is dominant over the allele for a hairless body (b). This Punnett square shows a cross between two deer mice."	"closed choice"	"grade8"	"natural science"	"biology"	"Genes to traits"	"Use Punnett squares to calculate ratios of offspring types"	"Offspring phenotypes: dominant or recessive? How do you determine an organism's phenotype for a trait? Look at the combination of alleles in the organism's genotype for the gene that affects that trait. Some alleles have types called dominant and recessive. These two types can cause different versions of the trait to appear as the organism's phenotype. If an organism's genotype has at least one dominant allele for a gene, the organism's phenotype will be the dominant allele's version of the gene's trait. If an organism's genotype has only recessive alleles for a gene, the organism's phenotype will be the recessive allele's version of the gene's trait. A Punnett square shows what types of offspring a cross can produce. The expected ratio of offspring types compares how often the cross produces each type of offspring, on average. To write this ratio, count the number of boxes in the Punnett square representing each type. For example, consider the Punnett square below. \| F \| f F \| FF \| Ff f \| Ff \| ff There is 1 box with the genotype FF and 2 boxes with the genotype Ff. So, the expected ratio of offspring with the genotype FF to those with Ff is 1:2. "	"To determine how many boxes in the Punnett square represent offspring with a hairy body or a hairless body, consider whether each phenotype is the dominant or recessive allele's version of the body hair trait. The question tells you that the B allele, which is for a hairy body, is dominant over the b allele, which is for a hairless body. A hairy body is the dominant allele's version of the body hair trait. A deer mouse with the dominant version of the body hair trait must have at least one dominant allele for the body hair gene. So, offspring with a hairy body must have the genotype BB or Bb. All 4 boxes in the Punnett square have the genotype BB or Bb. A hairless body is the recessive allele's version of the body hair trait. A deer mouse with the recessive version of the body hair trait must have only recessive alleles for the body hair gene. So, offspring with a hairless body must have the genotype bb. There are 0 boxes in the Punnett square with the genotype bb. So, the expected ratio of offspring with a hairy body to offspring with a hairless body is 4:0. This means that, based on the Punnett square, this cross will always produce offspring with a hairy body. This cross is expected to never produce offspring with a hairless body."
Not supported with pagination yet	"Which object has more thermal energy?"	[ "a cherry pie at a temperature of 90°F", "a cherry pie at a temperature of 85°F" ]	0	"The objects are identical except for their temperatures."	"closed choice"	"grade3"	"natural science"	"physics"	"Heat and thermal energy"	"How is temperature related to thermal energy?"	"All solids, liquids, and gases are made of matter. Matter is made up of tiny particles that are always moving. The energy from the motion of these particles is called thermal energy. Temperature measures how hot or cold matter is. If the particles in matter move faster, the temperature goes up. The matter now has both more thermal energy and a higher temperature."	"The two cherry pies have the same mass but different temperatures. Since the 90°F pie is hotter than the 85°F pie, it has more thermal energy."
Not supported with pagination yet	"Is the following trait inherited or acquired? Bobby has a scar on his left leg."	[ "inherited", "acquired" ]	1	"Hint: Most scars are caused by accidents during a person's life."	"closed choice"	"grade3"	"natural science"	"biology"	"Heredity"	"Identify inherited and acquired traits"	"Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways. Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned. Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Children do not inherit their parents' acquired traits."	"Children do not inherit their parent's scars. Instead, scars are caused by the environment. People can get scars after they get hurt. So, having a scar is an acquired trait."
Not supported with pagination yet	"Which word would you find on a dictionary page with the following guide words? file - four"	[ "flea", "fatigue" ]	0	""	"closed choice"	"grade4"	"language science"	"reference-skills"	"Reference skills"	"Use guide words"	"Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order. To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second letters. If the second letters are the same, look at the third letters, and so on. If one word is shorter, and there are no more letters to compare, then the shorter word comes first in alphabetical order. For example, be comes before bed."	"Put the words in alphabetical order. Since flea is between the guide words file - four, it would be found on that page."
	"Identify the question that Gabe's experiment can best answer."	[ "Do more bacteria grow in liquid with cinnamon than in liquid without cinnamon?", "Does temperature affect how much bacteria can grow in liquid?" ]	0	"The passage below describes an experiment. Read the passage and then follow the instructions below. Gabe mixed bacteria into a nutrient-rich liquid where the bacteria could grow. He poured four ounces of the mixture into each of ten glass flasks. In five of the ten flasks, he also added one teaspoon of cinnamon. He allowed the bacteria in the flasks to grow overnight in a 37°C room. Then, Gabe used a microscope to count the number of bacteria in a small sample from each flask. He compared the amount of bacteria in the liquid with cinnamon to the amount of bacteria in the liquid without cinnamon. Figure: flasks of liquid for growing bacteria."	"closed choice"	"grade6"	"natural science"	"science-and-engineering-practices"	"Designing experiments"	"Identify the experimental question"	"Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment. Imagine an experiment with two groups of daffodil plants. One group of plants was grown in sandy soil, and the other was grown in clay soil. Then, the height of each plant was measured. First, identify the part of the experiment that was tested. The part of an experiment that is tested usually involves the part of the experimental setup that is different or changed. In the experiment described above, each group of plants was grown in a different type of soil. So, the effect of growing plants in different soil types was tested. Then, identify the part of the experiment that was measured. The part of the experiment that is measured may include measurements and calculations. In the experiment described above, the heights of the plants in each group were measured. Experiments can answer questions about how the part of the experiment that is tested affects the part that is measured. So, the experiment described above can answer questions about how soil type affects plant height. Examples of questions that this experiment can answer include: Does soil type affect the height of daffodil plants? Do daffodil plants in sandy soil grow taller than daffodil plants in clay soil? Are daffodil plants grown in sandy soil shorter than daffodil plants grown in clay soil?"	""
Not supported with pagination yet	"Using only these supplies, which question can Jeremiah investigate with an experiment?"	[ "Is the pet lizard more active when its tank is heated with one heating lamp or with two heating lamps?", "Is the pet lizard more active when it is fed insects or lettuce?", "Is the pet lizard more active when it is fed crickets or mealworms?" ]	2	"Jeremiah has a pet lizard. Jeremiah notices that on some days, the lizard is active and runs around the tank. On other days, the lizard hardly moves at all. Jeremiah wonders what factors affect how active his lizard is. So, he decides to design an experiment. He has the following supplies available: one pet lizard live crickets live mealworms one heating lamp"	"closed choice"	"grade8"	"natural science"	"science-and-engineering-practices"	"Designing experiments"	"Identify questions that can be investigated with a set of materials"	"Experiments can be designed to answer specific questions. When designing an experiment, you must identify the supplies that are necessary to answer your question. In order to do this, you need to figure out what will be tested and what will be measured during the experiment. Imagine that you are wondering if plants grow to different heights when planted in different types of soil. How might you decide what supplies are necessary to conduct this experiment? First, you need to identify the part of the experiment that will be tested, which is the independent variable. This is usually the part of the experiment that is different or changed. In this case, you would like to know how plants grow in different types of soil. So, you must have different types of soil available. Next, you need to identify the part of the experiment that will be measured or observed, which is the dependent variable. In this experiment, you would like to know if some plants grow taller than others. So, you must be able to compare the plants' heights. To do this, you can observe which plants are taller by looking at them, or you can measure their exact heights with a meterstick. So, if you have different types of soil and can observe or measure the heights of your plants, then you have the supplies you need to investigate your question with an experiment!"	""
Not supported with pagination yet	"Based on this information, what is Bambi's genotype for the coat color gene?"	[ "a black coat", "LL" ]	1	"In a group of cows, some individuals have a black coat and others have a red coat. In this group, the gene for the coat color trait has two alleles. The allele L is for a black coat, and the allele l is for a red coat. Bambi, a cow from this group, has a black coat. Bambi has two alleles for a black coat."	"closed choice"	"grade7"	"natural science"	"biology"	"Genes to traits"	"Genetics vocabulary: genotype and phenotype"	"All organisms have pieces of hereditary material called genes, which are passed from parents to offspring. Genes contain instructions for building the parts of an organism. An organism's genes affect its observable traits, including its appearance, its behavior, and which diseases it may have. Genes may have different alleles, or forms, that can cause different versions of a trait. For example, flower color is a trait in pea plants. The gene for this trait has two possible alleles. Each allele is represented by an uppercase or lowercase letter. The allele F is for purple flowers, and the allele f is for white flowers. Each pea plant has two alleles for the flower color gene—one allele inherited from each parent. An organism's genotype for a gene is its combination of alleles for that gene. So, a pea plant may have a genotype of FF, Ff, or ff for the flower color gene. An organism's phenotype for a trait is its observable version of that trait, which depends on the organism's combination of alleles. A pea plant may have a phenotype of purple flowers or white flowers for the flower color trait."	"An organism's genotype for a gene is its combination of alleles for that gene. Bambi has two alleles for a black coat (L). So, Bambi's genotype for the coat color gene is LL."
Not supported with pagination yet	"Would you find the word oasis on a dictionary page with the following guide words? orange - ought"	[ "no", "yes" ]	0	""	"yes or no"	"grade2"	"language science"	"reference-skills"	"Reference skills"	"Use guide words"	"Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order. To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second letters. If the second letters are the same, look at the third letters, and so on."	"Put the words in alphabetical order. Since oasis is not between the guide words orange - ought, it would not be found on that page."
	"Is a scarf a solid or a liquid?"	[ "a solid", "a liquid" ]	0	""	"closed choice"	"grade2"	"natural science"	"physics"	"States of matter"	"Classify matter as solid or liquid"	"Solid and liquid are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms. When matter is a solid, it has a shape of its own. Some solids can be bent or broken easily. Others are hard to bend or break. A glass cup is a solid. A sock is also a solid. When matter is a liquid, it takes the shape of its container. Think about pouring a liquid from a cup into a bottle. The shape of the liquid is different in the cup than in the bottle. But the liquid still takes up the same amount of space. Juice is a liquid. Honey is also a liquid."	"A scarf is a solid. You can fold a scarf. But it will still have a size and shape of its own."
	"Which animal is also adapted for climbing trees?"	[ "takin", "red-handed tamarin" ]	1	"s live in rain forests on the island of Sumatra in Asia. They climb trees to find food and shelter. The orangutan's hands and feet are adapted for climbing trees. Figure: Sumatran orangutan."	"closed choice"	"grade4"	"natural science"	"biology"	"Adaptations"	"Animal adaptations: feet and limbs"	"An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with thick fur might help an animal walk on cold, snowy ground."	"Look at the picture of the Sumatran orangutan. The Sumatran orangutan has long fingers and toes. It is adapted for climbing trees. The Sumatran orangutan uses its long fingers and toes to hold on to branches while climbing. Now look at each animal. Figure out which animal has a similar adaptation. The red-handed tamarin has long fingers and toes. It is adapted for climbing trees. The takin has four hoofed feet. It is not adapted for climbing trees. The takin uses its feet to walk and run."
Not supported with pagination yet	"Which word does not rhyme?"	[ "bike", "hike", "fine" ]	2	""	"closed choice"	"grade2"	"language science"	"phonological-awareness"	"Rhyming"	"Which word does not rhyme?"	"Rhyming words are words that end with the same sound. The words tip and slip rhyme. They both end with the same sound. The words meet and treat also rhyme. They both end with the same sound, even though the sound has two different spellings. The words tip and meet don't rhyme. They end with different sounds."	"The words hike and bike rhyme. They both end with the ike sound. The word fine does not rhyme. It ends with a different sound."
Not supported with pagination yet	"Which is a compound sentence?"	[ "Last night we heard an owl outside in the oak tree.", "I ate all of my dinner, so I can have some pie." ]	1	""	"closed choice"	"grade3"	"language science"	"grammar"	"Sentences, fragments, and run-ons"	"Is the sentence simple or compound?"	"A simple sentence is a sentence with only one subject and predicate. The pitcher threw the ball to first base. A compound sentence is two simple sentences joined by a comma and a conjunction such as and, but, or, or so. The pitcher threw the ball, and the batter hit it. Some simple sentences have a compound subject or a compound predicate, but they are not compound sentences. Anna and James will watch the fireworks tonight. This simple sentence has a compound subject, Anna and James. The singers bowed and walked off the stage. This simple sentence has a compound predicate, bowed and walked off the stage. Some simple sentences have introductory phrases, but they are not compound sentences. The introductory phrase is part of the predicate. In the winter, Farmer Ben wears his heavy coat. This is a simple sentence. There is one subject, Farmer Ben, and one predicate, wears his heavy coat in the winter."	"The first sentence is the compound sentence. It is made up of two simple sentences joined by a comma and the conjunction so. I ate all of my dinner, so I can have some pie."
Not supported with pagination yet	"Is this a run-on sentence? If you have a hankering for a delicious bowl of soup, you should try Mr. Montoya's smoked French onion soup made with Vidalia onions, smoked Gruyère cheese, and fresh thyme."	[ "no", "yes" ]	0	""	"yes or no"	"grade12"	"language science"	"writing-strategies"	"Sentences, fragments, and run-ons"	"Identify run-on sentences"	"A sentence is a group of words that expresses a complete thought. The band I'm in has been rehearsing daily because we have a concert in two weeks. A run-on sentence is formed when two sentences are run together, joined by just a comma or by no punctuation at all. If only a comma is used, the run-on is called a comma splice. The band I'm in has been rehearsing daily, we have a concert in two weeks. The band I'm in has been rehearsing daily we have a concert in two weeks. There are several ways to fix a run-on sentence: Use stronger punctuation, such as a period or a semicolon. The band I'm in has been rehearsing daily. We have a concert in two weeks. The band I'm in has been rehearsing daily; we have a concert in two weeks. Use a comma and a coordinating conjunction to create a compound sentence. Coordinating conjunctions include and, but, or, and so. The band I'm in has been rehearsing daily, and we have a concert in two weeks. Use a subordinating conjunction or a relative pronoun to create a complex sentence. Subordinating conjunctions include after, although, as, because, before, if, since, unless, until, when, and while. Relative pronouns include that, which, who, whom, and whose. The band I'm in has been rehearsing daily since we have a concert in two weeks."	"This is not a run-on sentence. It is not formed from two sentences that have been run together without appropriate punctuation. If you have a hankering for a delicious bowl of soup, you should try Mr. Montoya's smoked French onion soup made with Vidalia onions, smoked Gruyère cheese, and fresh thyme."
	"Which of the following was a dependent variable in this experiment?"	[ "the type of liquid used", "the number of rusted steel squares" ]	1	"The passage below describes an experiment. Read the passage and think about the variables that are described. Pam was using steel to make rusted sculptures. After building each sculpture, she caused the steel in the sculpture to rust by placing it into a tub filled with salt water for eight hours. Pam wondered if steel would rust faster submerged in vinegar instead of salt water. To find out, Pam cut ten squares of steel sheet metal and split them into two equal groups. She put one group of squares into a tub filled with salt water and the other group of squares into a tub filled with vinegar. Once an hour for eight hours, Pam counted the number of rusted steel squares in each group. Hint: An independent variable is a variable whose effect you are investigating. A dependent variable is a variable that you measure. Figure: a sculpture made from rusted steel."	"closed choice"	"grade6"	"natural science"	"science-and-engineering-practices"	"Designing experiments"	"Identify independent and dependent variables"	"Experiments have variables, or parts that change. You can design an experiment to find out how one variable affects another variable. For example, imagine that you want to find out if fertilizer affects the number of tomatoes a tomato plant grows. To answer this question, you decide to set up two equal groups of tomato plants. Then, you add fertilizer to the soil of the plants in one group but not in the other group. Later, you measure the effect of the fertilizer by counting the number of tomatoes on each plant. In this experiment, the amount of fertilizer added to the soil and the number of tomatoes were both variables. The amount of fertilizer added to the soil was an independent variable because it was the variable whose effect you were investigating. This type of variable is called independent because its value does not depend on what happens after the experiment begins. Instead, you decided to give fertilizer to some plants and not to others. The number of tomatoes was a dependent variable because it was the variable you were measuring. This type of variable is called dependent because its value can depend on what happens in the experiment."	""
Not supported with pagination yet	"Last year, there were seven men's clothing stores on Main Street in Springtown. This year, there are only three. What probably happened to the overall supply of men's shirts in Springtown?"	[ "The supply probably went up.", "The supply probably went down." ]	1	""	"closed choice"	"grade8"	"social science"	"economics"	"Supply and demand"	"Understand overall supply and demand"	"Overall supply is the total amount of a good or service that producers make and sell. There are several things that can make overall supply go up or down. The table below shows how changes to these things might affect overall supply. \| Resources \| Number of producers or suppliers \| Expected change in demand Supply goes up \| when resources cost less or are easier to get \| when there are more producers or suppliers \| when demand is expected to go up Supply goes down \| when resources cost more or are harder to get \| when there are fewer producers or suppliers \| when demand is expected to go down Producers are people or companies that make goods or provide services. Suppliers are people or companies that sell goods or services. New inventions or technologies can also help workers produce goods and services more quickly. As a result of these changes, the supply of a good or service will often go up."	"When four men's clothing stores closed on Main Street, the number of suppliers went down. There were fewer stores selling men's shirts. So, the supply of men's shirts probably went down."
Not supported with pagination yet	"Would you find the word forgot on a dictionary page with the following guide words? false - fro"	[ "yes", "no" ]	0	""	"yes or no"	"grade7"	"language science"	"reference-skills"	"Reference skills"	"Use guide words"	"Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order. To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second letters. If the second letters are the same, look at the third letters, and so on. If one word is shorter, and there are no more letters to compare, then the shorter word comes first in alphabetical order. For example, be comes before bed."	"Put the words in alphabetical order. Since forgot is between the guide words false - fro, it would be found on that page."
Not supported with pagination yet	"Which sentence states a fact?"	[ "The prettiest parts of the Rocky Mountains are in the state of Wyoming.", "In the United States, the Rocky Mountains stretch from New Mexico to Montana." ]	1	""	"closed choice"	"grade3"	"language science"	"writing-strategies"	"Opinion writing"	"Distinguish facts from opinions"	"A fact is something that can be proved to be true. The month of July has more days than the month of June. This is a fact. It can be proved by looking at a calendar and counting the number of days in each month. An opinion is something that a person believes, thinks, or feels. An opinion cannot be proved true. July is a better month than June for camping. This is an opinion. People may have different opinions about which month is "better" for camping."	"The second sentence states a fact. In the United States, the Rocky Mountains stretch from New Mexico to Montana. It can be proved by checking a map of the United States. The first sentence states an opinion. The prettiest parts of the Rocky Mountains are in the state of Wyoming. Prettiest shows what a person believes, thinks, or feels. Another person might have a different opinion about where the prettiest parts of the Rocky Mountains are."
Not supported with pagination yet	"How long is a walk across Central Park in New York City?"	[ "3 centimeters", "3 millimeters", "3 kilometers", "3 meters" ]	2	"Select the best estimate."	"closed choice"	"grade6"	"natural science"	"units-and-measurement"	"Units and measurement"	"Choose metric units of distance, mass, and volume"	"Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means. When you are using metric units, length can be written with units of millimeters, centimeters, meters, or kilometers. One meter contains 100 centimeters or 1,000 millimeters. So, 1 meter is larger than 1 centimeter, and 1 centimeter is larger than 1 millimeter. The tip of the pencil shown here is only 1 millimeter wide, but the pencil is about 16 centimeters long. A red fox is about 1 meter long. The Sydney Harbour Bridge in Australia is about 1,000 meters, or 1 kilometer, in length."	"The best estimate for the length of a walk across Central Park in New York City is 3 kilometers. 3 millimeters, 3 centimeters, and 3 meters are all too short."
Not supported with pagination yet	"Does this passage describe the weather or the climate? There was rain and sleet in Sioux Falls, South Dakota, last weekend."	[ "weather", "climate" ]	0	""	"closed choice"	"grade5"	"natural science"	"earth-science"	"Weather and climate"	"What's the difference between weather and climate?"	"The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere. Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day. Climate is the pattern of weather in a certain place. For example, summer temperatures in New York are usually higher than winter temperatures."	"Read the text carefully. There was rain and sleet in Sioux Falls, South Dakota, last weekend. This passage tells you about the precipitation in Sioux Falls last weekend. It describes the atmosphere at a certain place and time. So, this passage describes the weather."
	"Think about the magnetic force between the magnets in each pair. Which of the following statements is true?"	[ "The magnitude of the magnetic force is smaller in Pair 2.", "The magnitude of the magnetic force is smaller in Pair 1.", "The magnitude of the magnetic force is the same in both pairs." ]	0	"The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material, but some of them are different shapes."	"closed choice"	"grade5"	"natural science"	"physics"	"Magnets"	"Compare magnitudes of magnetic forces"	"Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by changing the distance between them. The magnitude of the magnetic force is smaller when there is a greater distance between the magnets."	"The magnets in Pair 2 attract. The magnets in Pair 1 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Distance affects the magnitude of the magnetic force. When there is a greater distance between magnets, the magnitude of the magnetic force between them is smaller. There is a greater distance between the magnets in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is smaller in Pair 2 than in Pair 1."
	"Is chalk a solid, a liquid, or a gas?"	[ "a liquid", "a solid", "a gas" ]	1	""	"closed choice"	"grade3"	"natural science"	"physics"	"States of matter"	"Classify matter as solid, liquid, or gas"	"Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms. When matter is a solid, it has a definite volume and a definite shape. So, a solid has a size and shape of its own. Some solids can be easily folded, bent, or broken. A piece of paper is a solid. Also, some solids are very small. A grain of sand is a solid. When matter is a liquid, it has a definite volume but not a definite shape. So, a liquid has a size of its own, but it does not have a shape of its own. Think about pouring juice from a bottle into a cup. The juice still takes up the same amount of space, but it takes the shape of the bottle. Some liquids do not pour as easily as others. Honey and milk are both liquids. But pouring honey takes more time than pouring milk. When matter is a gas, it does not have a definite volume or a definite shape. A gas expands, or gets bigger, until it completely fills a space. A gas can also get smaller if it is squeezed into a smaller space. Many gases are invisible. Air is a gas."	"Chalk is a solid. You can easily break chalk into pieces. But each piece will still have a size and shape of its own."
Not supported with pagination yet	"Select the temperature shown by this thermometer."	[ "45°F", "30°F", "80°F" ]	0	""	"closed choice"	"grade3"	"natural science"	"units-and-measurement"	"Weather and climate"	"Read a thermometer"	"A thermometer is a tool that measures temperature. Temperature can be measured in degrees. The symbol for degrees is °. Some thermometers measure temperature in degrees Fahrenheit (°F). Fahrenheit is one scale used to measure temperature. This is a tube thermometer. It has a tube filled with a red liquid. There is a Fahrenheit scale along the right side of the tube. The top of the red liquid lines up with the number 80 on the scale. So, the temperature shown by this thermometer is 80°F."	"Find the top of the red liquid. Now look at the scale to the right. The top of the red liquid is halfway between 40 and 50. So, the temperature is 45°F."
Not supported with pagination yet	"Which is a compound sentence?"	[ "Mr. Smith peeled the tangerine and divided it into sections.", "Before the performance, Maura tied a satin sash around her waist, and Kimberly braided her hair." ]	1	""	"closed choice"	"grade5"	"language science"	"grammar"	"Sentences, fragments, and run-ons"	"Is the sentence simple, compound, or complex?"	"A clause is a group of words that contains both a subject and a predicate. An independent clause is a complete thought. It can stand alone as a sentence. A dependent clause is not a complete thought. It cannot stand alone as a sentence. the oranges on our tree are ripe The clause can stand alone. It is independent. after we pick up Kevin from work The clause cannot stand alone. It is dependent. A simple sentence is made up of a single independent clause. Ben and I spent all day relaxing by the pool. Some simple sentences have introductory phrases, but the introductory phrase is part of the predicate. In the winter, Ben usually wears his heavy coat. Ben usually wears his heavy coat in the winter. A compound sentence is made up of two independent clauses joined by a coordinating conjunction such as and, but, or, or so. We saw a flash of lightning, and seconds later we heard the rumble of thunder. A complex sentence is made up of an independent clause and a dependent clause. The dependent clause usually begins with a subordinating conjunction such as after, although, as, because, before, if, since, unless, until, when, or while. If she ever gets the chance, Terri would love to visit the Egyptian pyramids."	"The first sentence is the compound sentence. It is made up of two independent clauses joined by the coordinating conjunction and. Before the performance, Maura tied a satin sash around her waist, and Kimberly braided her hair."
Not supported with pagination yet	"Based on this information, what is Squirt's phenotype for the tail spots trait?"	[ "a spotted tail", "an unspotted tail" ]	0	"In a group of guppies, some individuals have a spotted tail and others have an unspotted tail. In this group, the gene for the tail spots trait has two alleles. The allele for a spotted tail (I) is dominant over the allele for an unspotted tail (i). Squirt is a guppy from this group. Squirt has the heterozygous genotype Ii for the tail spots gene."	"closed choice"	"grade8"	"natural science"	"biology"	"Genes to traits"	"Genetics vocabulary: dominant and recessive"	"All organisms have pieces of hereditary material called genes, which are passed from parents to offspring. Genes contain instructions for building the parts of an organism. An organism's genes affect its observable traits, including its appearance, its behavior, and which diseases it may have. Genes may have different alleles, or forms, that can cause different versions of a trait. For example, flower color is a trait in pea plants. The gene for this trait has two possible alleles. Each allele is represented by an uppercase or lowercase letter. The allele F is for purple flowers, and the allele f is for white flowers. Each pea plant has two alleles for the flower color gene—one allele inherited from each parent. An organism's genotype for a gene is its combination of alleles for that gene. So, a pea plant may have a genotype of FF, Ff, or ff for the flower color gene. An organism's phenotype for a trait is its observable version of that trait, which depends on the organism's combination of alleles. A pea plant may have a phenotype of purple flowers or white flowers for the flower color trait. Some traits, like flower color in pea plants, are controlled by a single gene. Most plants and animals have a genotype made up of two alleles for these traits. These two alleles determine whether an organism is homozygous or heterozygous for the gene. An organism with two identical alleles for a gene is homozygous for that gene. A pea plant with the genotype FF or ff is homozygous for the flower color gene. An organism with two different alleles for a gene is heterozygous for that gene. A pea plant with the genotype Ff is heterozygous for the flower color gene. The types of alleles in an organism's genotype determine the organism's phenotype. Some alleles have types called dominant and recessive. These two types can cause different versions of a trait to appear as the organism's phenotype. A dominant allele causes its version of the trait to appear even when the organism also has a recessive allele for the gene. In pea plants, the F allele, which causes purple flowers, is dominant over the f allele. A pea plant with at least one F allele will have the F allele's version of the flower color trait. So, a plant with the genotype FF or Ff will have purple flowers. A recessive allele causes its version of the trait to appear only when the organism does not have any dominant alleles for the gene. In pea plants, the f allele, which causes white flowers, is recessive to the F allele. A pea plant with only f alleles will have the f allele's version of the flower color trait. So, a plant with the genotype ff will have white flowers."	"You need to determine Squirt's phenotype for the tail spots trait. First, consider the alleles in Squirt's genotype for the tail spots gene. Then, decide whether these alleles are dominant or recessive. The allele for a spotted tail (I) is dominant over the allele for an unspotted tail (i). This means I is a dominant allele, and i is a recessive allele. Squirt's genotype of Ii has one dominant allele and one recessive allele. An organism with at least one dominant allele for a gene will have the dominant allele's version of the trait. So, Squirt's phenotype for the tail spots trait must be a spotted tail."
Not supported with pagination yet	"Select the reptile."	[ "eagle ray", "dwarf crocodile", "California newt", "harbor seal" ]	1	""	"closed choice"	"grade5"	"natural science"	"biology"	"Classification"	"Identify mammals, birds, fish, reptiles, and amphibians"	"Reptiles have scaly, waterproof skin. Most reptiles live on land."	"An eagle ray is a fish. It lives underwater. It has fins, not limbs. Rays have a different shape than many other fish. Rays are large and flat. They have wide, triangle-shaped fins that help them swim long distances. A harbor seal is a mammal. It has fur and feeds its young milk. Seals have flippers instead of arms! They use their flippers to swim underwater or to crawl on the beach. A dwarf crocodile is a reptile. It has scaly, waterproof skin. Crocodiles hunt their prey in or near water. A California newt is an amphibian. It has moist skin and begins its life in water. Some newts live in water. Other newts live on land but lay their eggs in water."
	"Which solution has a higher concentration of yellow particles?"	[ "neither; their concentrations are the same", "Solution B", "Solution A" ]	1	"The diagram below is a model of two solutions. Each yellow ball represents one particle of solute."	"closed choice"	"grade7"	"natural science"	"chemistry"	"Solutions"	"Compare concentrations of solutions"	"A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent"	"In Solution A and Solution B, the yellow particles represent the solute. To figure out which solution has a higher concentration of yellow particles, look at both the number of yellow particles and the volume of the solvent in each container. Use the concentration formula to find the number of yellow particles per milliliter. Solution B has more yellow particles per milliliter. So, Solution B has a higher concentration of yellow particles."
Not supported with pagination yet	"Would you find the word miracle on a dictionary page with the following guide words? mean - mumps"	[ "no", "yes" ]	1	""	"yes or no"	"grade8"	"language science"	"reference-skills"	"Reference skills"	"Use guide words"	"Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order. To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second letters. If the second letters are the same, look at the third letters, and so on. If one word is shorter, and there are no more letters to compare, then the shorter word comes first in alphabetical order. For example, be comes before bed."	"Put the words in alphabetical order. Since miracle is between the guide words mean - mumps, it would be found on that page."
Not supported with pagination yet	"Which greeting is correct for a letter?"	[ "Dear ms. Allen,", "Dear Ms. Allen," ]	1	""	"closed choice"	"grade4"	"language science"	"punctuation"	"Formatting"	"Greetings and closings of letters"	"A letter starts with a greeting and ends with a closing. For each one, capitalize the first word and end with a comma. You should also capitalize proper nouns, such as Aunt Sue. Dear Aunt Sue, I'm glad you could come to my party, and thank you for the birthday gift. I could not have asked for a better one! Every time I see it, I think of you. With love, Rory"	"The first greeting is correct: Its first word is capitalized, and it ends with a comma. Ms. Allen is capitalized because it is a proper noun."
Not supported with pagination yet	"Using only these supplies, which question can Stefan investigate with an experiment?"	[ "Does vegetable oil separate faster when stirred together with vinegar or with water?", "Does vegetable oil separate faster when stirred together with cold water or with hot water?", "Does vinegar separate faster when stirred together with olive oil or with coconut oil?" ]	0	"Stefan mixes oil and vinegar to make salad dressing. He notices that after a few minutes, the oil and vinegar separate. He wonders what factors affect how quickly liquids separate. So, he decides to design an experiment. He has the following supplies available: three glass bottles olive oil vegetable oil vinegar cold water"	"closed choice"	"grade8"	"natural science"	"science-and-engineering-practices"	"Designing experiments"	"Identify questions that can be investigated with a set of materials"	"Experiments can be designed to answer specific questions. When designing an experiment, you must identify the supplies that are necessary to answer your question. In order to do this, you need to figure out what will be tested and what will be measured during the experiment. Imagine that you are wondering if plants grow to different heights when planted in different types of soil. How might you decide what supplies are necessary to conduct this experiment? First, you need to identify the part of the experiment that will be tested, which is the independent variable. This is usually the part of the experiment that is different or changed. In this case, you would like to know how plants grow in different types of soil. So, you must have different types of soil available. Next, you need to identify the part of the experiment that will be measured or observed, which is the dependent variable. In this experiment, you would like to know if some plants grow taller than others. So, you must be able to compare the plants' heights. To do this, you can observe which plants are taller by looking at them, or you can measure their exact heights with a meterstick. So, if you have different types of soil and can observe or measure the heights of your plants, then you have the supplies you need to investigate your question with an experiment!"	""
	"Which animal's feet are also adapted for swimming?"	[ "blue-footed booby", "tokay gecko" ]	0	"s spend much of their lives at sea. They eat mostly fish, which they catch while swimming and diving. The feet of the are adapted for swimming. Figure: Atlantic puffin."	"closed choice"	"grade3"	"natural science"	"biology"	"Adaptations"	"Animal adaptations: feet and limbs"	"An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with thick fur might help an animal walk on cold, snowy ground."	"Look at the picture of the Atlantic puffin. The Atlantic puffin has webbed feet. Its feet are adapted for swimming. As it swims, the Atlantic puffin uses its webbed feet to push itself through water. Now look at each animal. Figure out which animal has a similar adaptation. The blue-footed booby has webbed feet. Its feet are adapted for swimming. The tokay gecko has wide, sticky toes. Its feet are not adapted for swimming. The tokay gecko uses its feet to climb trees and walk on leaves."
Not supported with pagination yet	"Which is a simple sentence?"	[ "In the early morning, I drank tea by a spice stall as the Turkish bazaar came to life.", "The gutters were full of leaves and in need of cleaning." ]	1	""	"closed choice"	"grade5"	"language science"	"grammar"	"Sentences, fragments, and run-ons"	"Is the sentence simple, compound, or complex?"	"A clause is a group of words that contains both a subject and a predicate. An independent clause is a complete thought. It can stand alone as a sentence. A dependent clause is not a complete thought. It cannot stand alone as a sentence. the oranges on our tree are ripe The clause can stand alone. It is independent. after we pick up Kevin from work The clause cannot stand alone. It is dependent. A simple sentence is made up of a single independent clause. Ben and I spent all day relaxing by the pool. Some simple sentences have introductory phrases, but the introductory phrase is part of the predicate. In the winter, Ben usually wears his heavy coat. Ben usually wears his heavy coat in the winter. A compound sentence is made up of two independent clauses joined by a coordinating conjunction such as and, but, or, or so. We saw a flash of lightning, and seconds later we heard the rumble of thunder. A complex sentence is made up of an independent clause and a dependent clause. The dependent clause usually begins with a subordinating conjunction such as after, although, as, because, before, if, since, unless, until, when, or while. If she ever gets the chance, Terri would love to visit the Egyptian pyramids."	"The first sentence is the simple sentence. It is a single independent clause. The gutters were full of leaves and in need of cleaning."
Not supported with pagination yet	"Assume all other forces on Tamir are balanced. Which statement describes the forces on Tamir?"	[ "The forces are balanced, so there is no net force on Tamir.", "The forces are unbalanced, so there is a net force on Tamir." ]	0	"Tamir is standing on a diving board at the pool. Earth's gravity is pulling down on Tamir with a force of 400N. The diving board is pushing up on Tamir with a force of 400N."	"closed choice"	"grade7"	"natural science"	"physics"	"Velocity, acceleration, and forces"	"Balanced and unbalanced forces"	"A force is a push or a pull that acts on an object. Every force has a direction and a magnitude, or strength. If two forces act on an object in opposite directions, the forces are called opposing forces. When opposing forces have the same magnitude, they are balanced. If all the forces on an object are balanced, there is no net force on the object. When opposing forces have different magnitudes, the forces are unbalanced. If any forces on an object are unbalanced, there is a net force on the object."	"To determine if there is a net force on Tamir, look at the forces: Earth's gravity is pulling Tamir down with a force of 400 N. The diving board is pushing Tamir up with a force of 400 N. The forces are in opposite directions, and the forces have the same magnitude: 400 N. This means that the forces are balanced, so there is no net force on Tamir."
	"Which solution has a higher concentration of green particles?"	[ "Solution A", "Solution B", "neither; their concentrations are the same" ]	0	"The diagram below is a model of two solutions. Each green ball represents one particle of solute."	"closed choice"	"grade6"	"natural science"	"chemistry"	"Solutions"	"Compare concentrations of solutions"	"A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent"	"In Solution A and Solution B, the green particles represent the solute. To figure out which solution has a higher concentration of green particles, look at both the number of green particles and the volume of the solvent in each container. Use the concentration formula to find the number of green particles per milliliter. Solution A has more green particles per milliliter. So, Solution A has a higher concentration of green particles."
Not supported with pagination yet	"Which sentence states a fact?"	[ "The giant anteater uses its sticky tongue to grab insects.", "The eating habits of the giant anteater are disgusting." ]	0	""	"closed choice"	"grade4"	"language science"	"writing-strategies"	"Developing and supporting arguments"	"Distinguish facts from opinions"	"A fact is something that can be proved to be true. The month of July has more days than the month of June. This is a fact. It can be proved by looking at a calendar and counting the number of days in each month. An opinion is something that a person believes, thinks, or feels. An opinion cannot be proved true. July is a better month than June for camping. This is an opinion. People may have different opinions about which month is "better" for camping."	"The first sentence states a fact. The giant anteater uses its sticky tongue to grab insects. It can be proved by looking up information about anteaters. The second sentence states an opinion. The eating habits of the giant anteater are disgusting. Disgusting shows what a person believes, thinks, or feels. Another person might have a different opinion about what is disgusting."
	"What is the capital of Washington?"	[ "Santa Fe", "Seattle", "New Orleans", "Olympia" ]	3	""	"closed choice"	"grade4"	"social science"	"geography"	"State capitals"	"Identify the 50 state capitals"	""	"Olympia is the capital of Washington."
	"What is the capital of New York?"	[ "Albany", "Lansing", "Buffalo", "Hartford" ]	0	""	"closed choice"	"grade3"	"social science"	"geography"	"State capitals"	"Identify state capitals of the Northeast"	""	"Albany is the capital of New York."
Not supported with pagination yet	"Which figure of speech is used in this text? Rebecca's Bistro used to be a great place to go for a delicious and carefully prepared dinner, but nobody goes there anymore: it's too crowded."	[ "apostrophe", "paradox" ]	1	""	"closed choice"	"grade11"	"language science"	"figurative-language"	"Literary devices"	"Classify the figure of speech: review"	"Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive. Anaphora is the repetition of the same word or words at the beginning of several phrases or clauses. We are united. We are powerful. We are winners. Antithesis involves contrasting opposing ideas within a parallel grammatical structure. I want to help, not to hurt. Apostrophe is a direct address to an absent person or a nonhuman entity. Oh, little bird, what makes you sing so beautifully? Assonance is the repetition of a vowel sound in a series of nearby words. Try to light the fire. Chiasmus is an expression in which the second half parallels the first but reverses the order of words. Never let a fool kiss you or a kiss fool you. A euphemism is a polite or indirect expression that is used to de-emphasize an unpleasant topic. The head of Human Resources would never refer to firing people, only to laying them off. Hyperbole is an obvious exaggeration that is not meant to be taken literally. I ate so much that I think I might explode! An oxymoron is a joining of two seemingly contradictory terms. Some reviewers are calling this book a new classic. A paradox is a statement that might at first appear to be contradictory, but that may in fact contain some truth. Always expect the unexpected. Understatement involves deliberately representing something as less serious or important than it really is. As you know, it can get a little cold in the Antarctic."	"The text uses a paradox, a statement that might at first appear to be contradictory, but that may in fact contain some truth. Nobody goes there anymore: it's too crowded at first appears to be contradictory, because if no one goes to the restaurant, then the restaurant should be empty, not crowded. However, it contains some truth: if a restaurant is frequently perceived to be too crowded, many people will no longer want to go there."
Not supported with pagination yet	"Complete the sentence. In this chemical reaction, glucose is a ()."	[ "reactant", "product" ]	1	"This passage describes a chemical reaction. Read the passage. Then, follow the instructions below. Plants make glucose, a sugar they can use for food, through a process called photosynthesis. During photosynthesis, plants use energy from sunlight to make glucose from water and carbon dioxide. In the process of making glucose, plants also create most of the oxygen in the air we breathe."	"closed choice"	"grade8"	"natural science"	"chemistry"	"Chemical reactions"	"Identify reactants and products"	"A chemical change occurs when new substances are formed from existing substances. This process is called a chemical reaction. In a chemical reaction, one or more substances change into one or more different substances. During the reaction, the atoms of the original substances are rearranged to form other substances. The original substances in a chemical reaction are called reactants. These substances react, or go through a chemical change. The substances that are formed in a chemical reaction are called products. These substances are produced by the chemical reaction. So, in a chemical reaction, reactants go through a chemical change to form products."	"Read the underlined text carefully. Look for information about what happens to glucose in this chemical reaction. Plants make glucose, a sugar they can use for food, through a process called photosynthesis. During photosynthesis, plants use energy from sunlight to make glucose from water and carbon dioxide. In the process of making glucose, plants also create most of the oxygen in the air we breathe. The underlined text tells you that glucose forms when water combines with carbon dioxide. Because glucose is produced by this chemical reaction, glucose is a product."
	"Which cones make pollen?"	[ "pollinated cones", "male cones" ]	1	"This diagram shows the life cycle of a pine tree."	"closed choice"	"grade8"	"natural science"	"biology"	"Plant reproduction"	"Angiosperm and conifer life cycles"	"Gymnosperms are plants that have seeds but not flowers. Conifers are a type of a gymnosperm. Instead of flowers, conifers have cones. Conifers use their cones for sexual reproduction. Most conifer trees have both male and female cones. The male cones produce pollen. The female cones produce eggs and a sticky substance on the edge of the cone. Male cones release pollen into the wind. Pollination happens when pollen lands on and sticks to the female cones. Self-pollination happens when pollen sticks to a female cone on the same tree. Cross-pollination happens when pollen sticks to a female cone on a different tree. After pollination, sperm from the pollen fuse with eggs at the base of the female cone's scales. This is called fertilization. The fertilized eggs grow into seeds inside the female cone. Conifer seeds are released from the fertilized cones. Many conifer seeds have wing-like structures. They can be carried long distances by the wind. When a seed lands on the ground, it can germinate and grow into a new plant. The new plant can grow cones and begin the conifer life cycle again."	"Male cones make pollen. When pollen sticks to a female cone, the female cone becomes pollinated. Pollinated cones do not produce pollen."
	"What can Debbie and Madelyn trade to each get what they want?"	[ "Madelyn can trade her broccoli for Debbie's oranges.", "Debbie can trade her tomatoes for Madelyn's broccoli.", "Debbie can trade her tomatoes for Madelyn's sandwich.", "Madelyn can trade her almonds for Debbie's tomatoes." ]	1	"Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another. Debbie and Madelyn open their lunch boxes in the school cafeteria. Both of them could be happier with their lunches. Debbie wanted broccoli in her lunch and Madelyn was hoping for tomatoes. Look at the images of their lunches. Then answer the question below."	"closed choice"	"grade6"	"social science"	"economics"	"Basic economic principles"	"Trade and specialization"	""	"Debbie wanted broccoli in her lunch and Madelyn was hoping for tomatoes. Look at the labeled part of the images. Debbie has tomatoes. Madelyn has broccoli. They can trade tomatoes for broccoli to both be happier. Trading other things would not help either person get more items they want."
Not supported with pagination yet	"Which figure of speech is used in this text? After spending weeks in New York City, Florence was a bit unnerved by the deafening silence of her small hometown."	[ "oxymoron", "euphemism" ]	0	""	"closed choice"	"grade12"	"language science"	"figurative-language"	"Literary devices"	"Classify the figure of speech: euphemism, hyperbole, oxymoron, paradox"	"Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive. A euphemism is a polite or indirect expression that is used to de-emphasize an unpleasant topic. The head of Human Resources would never refer to firing people, only to laying them off. Hyperbole is an obvious exaggeration that is not meant to be taken literally. I ate so much that I think I might explode! An oxymoron is a joining of two seemingly contradictory terms. Some reviewers are calling this book a new classic. A paradox is a statement that might at first appear to be contradictory, but that may in fact contain some truth. Always expect the unexpected."	"The text uses an oxymoron, a joining of two seemingly contradictory terms. Deafening silence is a contradiction, because deafening describes something extremely loud, and silence is the absence of sound."
Not supported with pagination yet	"Complete the statement. Assume that the sled's mass did not change. The gravitational potential energy stored between the sled and Earth () as Michelle rode down the hill."	[ "stayed the same", "decreased", "increased" ]	1	"Read the text about an object in motion. On a snowy day, Michelle rode her sled down a big hill."	"closed choice"	"grade7"	"natural science"	"physics"	"Kinetic and potential energy"	"Identify changes in gravitational potential energy"	"Gravitational potential energy is stored between any two objects. So, for every object on or near Earth, there is gravitational potential energy stored between the object and Earth. The amount of gravitational potential energy stored between an object and Earth depends on the mass of the object. The amount of gravitational potential energy also depends on the distance between the object and the center of Earth. This distance increases when the object moves higher and decreases when the object moves lower. If the distance between an object and the center of Earth changes, the gravitational potential energy stored between the object and Earth will change. The table below shows how this change can happen. When an object's mass stays the same and its distance from the center of Earth... \| Gravitational potential energy stored between the object and Earth... increases \| increases decreases \| decreases stays the same \| stays the same"	"Think about how the distance between the sled and the center of Earth changed. The bottom of the hill was lower than the point where Michelle started sledding. As Michelle rode toward the bottom of the hill, the distance between the sled and the center of Earth decreased. So, the gravitational potential energy stored between the sled and Earth decreased as Michelle rode down the hill."
Not supported with pagination yet	"Which closing is correct for a letter?"	[ "your friend,\nCarla", "Your friend,\nCarla" ]	1	""	"closed choice"	"grade2"	"language science"	"capitalization"	"Capitalization"	"Greetings and closings of letters"	"A letter starts with a greeting and ends with a closing. For each one, capitalize the first word and end with a comma. You should also capitalize proper nouns, such as Aunt Sue. Dear Aunt Sue, I'm glad you could come to my party, and thank you for the birthday gift. I could not have asked for a better one! Every time I see it, I think of you. With love, Rory"	"The second closing is correct: Its first word is capitalized, and it ends with a comma."
Not supported with pagination yet	"Based on this information, what is Zazu's phenotype for the cheek color trait?"	[ "pale orange cheeks", "bright orange cheeks" ]	1	"In a group of cockatiels, some individuals have bright orange cheeks and others have pale orange cheeks. In this group, the gene for the cheek color trait has two alleles. The allele for pale orange cheeks (r) is recessive to the allele for bright orange cheeks (R). Zazu is a cockatiel from this group. Zazu has the homozygous genotype RR for the cheek color gene."	"closed choice"	"grade8"	"natural science"	"biology"	"Genes to traits"	"Genetics vocabulary: dominant and recessive"	"All organisms have pieces of hereditary material called genes, which are passed from parents to offspring. Genes contain instructions for building the parts of an organism. An organism's genes affect its observable traits, including its appearance, its behavior, and which diseases it may have. Genes may have different alleles, or forms, that can cause different versions of a trait. For example, flower color is a trait in pea plants. The gene for this trait has two possible alleles. Each allele is represented by an uppercase or lowercase letter. The allele F is for purple flowers, and the allele f is for white flowers. Each pea plant has two alleles for the flower color gene—one allele inherited from each parent. An organism's genotype for a gene is its combination of alleles for that gene. So, a pea plant may have a genotype of FF, Ff, or ff for the flower color gene. An organism's phenotype for a trait is its observable version of that trait, which depends on the organism's combination of alleles. A pea plant may have a phenotype of purple flowers or white flowers for the flower color trait. Some traits, like flower color in pea plants, are controlled by a single gene. Most plants and animals have a genotype made up of two alleles for these traits. These two alleles determine whether an organism is homozygous or heterozygous for the gene. An organism with two identical alleles for a gene is homozygous for that gene. A pea plant with the genotype FF or ff is homozygous for the flower color gene. An organism with two different alleles for a gene is heterozygous for that gene. A pea plant with the genotype Ff is heterozygous for the flower color gene. The types of alleles in an organism's genotype determine the organism's phenotype. Some alleles have types called dominant and recessive. These two types can cause different versions of a trait to appear as the organism's phenotype. A dominant allele causes its version of the trait to appear even when the organism also has a recessive allele for the gene. In pea plants, the F allele, which causes purple flowers, is dominant over the f allele. A pea plant with at least one F allele will have the F allele's version of the flower color trait. So, a plant with the genotype FF or Ff will have purple flowers. A recessive allele causes its version of the trait to appear only when the organism does not have any dominant alleles for the gene. In pea plants, the f allele, which causes white flowers, is recessive to the F allele. A pea plant with only f alleles will have the f allele's version of the flower color trait. So, a plant with the genotype ff will have white flowers."	"Zazu's genotype for the cheek color gene is RR. Zazu's genotype of RR has only R allelles. The R allele is for bright orange cheeks. So, Zazu's phenotype for the cheek color trait must be bright orange cheeks. To check this answer, consider whether Zazu's alleles are dominant or recessive. The allele for pale orange cheeks (r) is recessive to the allele for bright orange cheeks (R). This means R is a dominant allele, and r is a recessive allele. Zazu's genotype of RR has two dominant alleles. An organism with at least one dominant allele for a gene will have the dominant allele's version of the trait. So, Zazu's phenotype for the cheek color trait must be bright orange cheeks."
	"Complete the statement. Palladium is ()."	[ "a compound", "an elementary substance" ]	1	"The model below represents palladium. Palladium is a metal that reacts with the gases produced by car engines to make the gases less harmful."	"closed choice"	"grade7"	"natural science"	"chemistry"	"Atoms and molecules"	"Classify elementary substances and compounds using models"	"There are more than 100 different chemical elements, or types of atoms. Chemical elements make up all of the substances around you. A substance may be composed of one chemical element or multiple chemical elements. Substances that are composed of only one chemical element are elementary substances. Substances that are composed of multiple chemical elements bonded together are compounds. Every chemical element is represented by its own atomic symbol. An atomic symbol may consist of one capital letter, or it may consist of a capital letter followed by a lowercase letter. For example, the atomic symbol for the chemical element fluorine is F, and the atomic symbol for the chemical element beryllium is Be. Scientists use different types of models to represent substances whose atoms are bonded in different ways. One type of model is a space-filling model. The space-filling model below represents the elementary substance copper. In a space-filling model, the balls represent atoms that are bonded together. The color of a ball represents a specific chemical element. The atomic symbol for that chemical element is shown in the legend."	"Use the model to determine whether palladium is an elementary substance or a compound. Step 1: Interpret the model. In the space-filling model shown above, all of the balls are the same color: . The legend shows that dark blue represents the chemical element with the atomic symbol Pd. So, the model shows you that palladium is composed of one chemical element. Step 2: Determine whether the substance is an elementary substance or a compound. You know from Step 1 that palladium is composed of only one chemical element. So, palladium is an elementary substance."
	"What is the probability that a Nile tilapia fish produced by this cross will have a greenish-brown body?"	[ "2/4", "3/4", "1/4", "0/4", "4/4" ]	4	"In a group of Nile tilapia fish, some individuals have a greenish-brown body and others have a pink body. In this group, the gene for the body color trait has two alleles. The allele for a pink body (b) is recessive to the allele for a greenish-brown body (B). This Punnett square shows a cross between two Nile tilapia fish."	"closed choice"	"grade8"	"natural science"	"biology"	"Genes to traits"	"Use Punnett squares to calculate probabilities of offspring types"	"Offspring phenotypes: dominant or recessive? How do you determine an organism's phenotype for a trait? Look at the combination of alleles in the organism's genotype for the gene that affects that trait. Some alleles have types called dominant and recessive. These two types can cause different versions of the trait to appear as the organism's phenotype. If an organism's genotype has at least one dominant allele for a gene, the organism's phenotype will be the dominant allele's version of the gene's trait. If an organism's genotype has only recessive alleles for a gene, the organism's phenotype will be the recessive allele's version of the gene's trait. In a Punnett square, each box represents a different outcome, or result. Each of the four outcomes is equally likely to happen. Each box represents one way the parents' alleles can combine to form an offspring's genotype. Because there are four boxes in the Punnett square, there are four possible outcomes. An event is a set of one or more outcomes. The probability of an event is a measure of how likely the event is to happen. This probability is a number between 0 and 1, and it can be written as a fraction: probability of an event = number of ways the event can happen / number of equally likely outcomes You can use a Punnett square to calculate the probability that a cross will produce certain offspring. For example, the Punnett square below has two boxes with the genotype Ff. It has one box with the genotype FF and one box with the genotype ff. This means there are two ways the parents' alleles can combine to form Ff. There is one way they can combine to form FF and one way they can combine to form ff. \| F \| f F \| FF \| Ff f \| Ff \| ff Consider an event in which this cross produces an offspring with the genotype ff. The probability of this event is given by the following fraction: number of ways the event can happen / number of equally likely outcomes = number of boxes with the genotype ff / total number of boxes = 1 / 4."	""
Not supported with pagination yet	"Select the vertebrate."	[ "redback spider", "common octopus", "birdwing butterfly", "asp viper" ]	3	"Hint: Mammals, birds, fish, reptiles, and amphibians are vertebrates."	"closed choice"	"grade5"	"natural science"	"biology"	"Classification"	"Identify vertebrates and invertebrates"	"Vertebrates and invertebrates are both groups of animals. A vertebrate has a backbone. The backbone is made of many bones in an animal's back. A vertebrate's backbone helps connect the different parts of its body. In the drawings below, each vertebrate's backbone is colored orange. An invertebrate does not have a backbone. In fact, invertebrates do not have any bones! Some invertebrates have an outer cover on their body called an exoskeleton. Other invertebrates have a soft body."	"Like other octopuses, a common octopus is an invertebrate. It does not have a backbone. It has a soft body. Like other spiders, a redback spider is an invertebrate. It does not have a backbone. It has an exoskeleton. A birdwing butterfly is an insect. Like other insects, a birdwing butterfly is an invertebrate. It does not have a backbone. It has an exoskeleton. An asp viper is a reptile. Like other reptiles, an asp viper is a vertebrate. It has a backbone."
Not supported with pagination yet	"Which tense does the sentence use? Mr. Norman signed his name on the letter."	[ "past tense", "present tense", "future tense" ]	0	""	"closed choice"	"grade2"	"language science"	"verbs"	"Verb tense"	"Is the sentence in the past, present, or future tense?"	"Present tense verbs tell you about something that is happening now. Most present-tense verbs are regular. They have no ending, or they end in -s or -es. Two verbs are irregular in the present tense, to be and to have. You must remember their forms. Past tense verbs tell you about something that has already happened. Most past-tense verbs are regular. They end in -ed. Some verbs are irregular in the past tense. You must remember their past-tense forms. Future tense verbs tell you about something that is going to happen. All future-tense verbs use the word will. Present \| Past \| Future walk, walks \| walked \| will walk go, goes \| went \| will go"	"The sentence is in past tense. You can tell because it uses a past-tense verb, signed. The verb ends in -ed and tells you about something that has already happened."
	"In this food chain, the Mojave yucca is a producer. Why?"	[ "It eats another living thing.", "It makes its own food." ]	1	"This diagram shows a food chain from a desert ecosystem in Southern California."	"closed choice"	"grade3"	"natural science"	"biology"	"Ecosystems"	"Identify roles in food chains"	"Every living thing needs food to stay alive. Living things get their food in different ways. A food chain shows how living things in an ecosystem get their food. Producers make their own food. Many producers use carbon dioxide, water, and sunlight to make sugar. This sugar is food for the producer. Consumers eat other living things. Consumers cannot make their own food."	"In this food chain, the Mojave yucca is a producer because it makes its own food. The Mojave yucca uses carbon dioxide, water, and sunlight to make its own food."
Not supported with pagination yet	"What do these two changes have in common? a banana getting ripe on the counter newly poured concrete becoming hard"	[ "Both are caused by heating.", "Both are chemical changes.", "Both are caused by cooling.", "Both are only physical changes." ]	1	""	"closed choice"	"grade7"	"natural science"	"chemistry"	"Chemical reactions"	"Compare physical and chemical changes"	"Matter is made of very small particles called atoms. Atoms can be linked together by chemical bonds. When two or more atoms link together, they form a molecule. In a chemical change, the chemical bonds in the molecules break. The atoms then link together to form different molecules. The types of molecules in matter before and after a chemical change are always different. Some chemical changes are caused by heating or cooling. For example, burning a piece of paper is a chemical change caused by heating. As paper burns, paper molecules react with oxygen molecules in the air. This reaction breaks the chemical bonds in the molecules. The atoms then link together in a different way to form different molecules. For example, carbon dioxide molecules are formed when paper burns. In a physical change, chemical bonds do not break. The types of molecules in matter before and after a physical change are always the same. A change of state is a type of physical change. Changes of state can be caused by heating or cooling. For example, water vaporizing is a physical change that can be caused by heating. Liquid water and water vapor are made of the same type of matter: water. The law of conservation of mass says that all physical and chemical changes conserve mass. Conserve means to keep the same. So, the total mass before a physical or chemical change is equal to the total mass after the change."	"Step 1: Think about each change. A banana getting ripe on the counter is a chemical change. As a banana ripens, the type of matter in it changes. The peel changes color and the inside becomes softer and sweeter. Concrete hardening is a chemical change. The chemicals in the concrete react with each other to form a different type of matter. The new matter is hard and strong. Step 2: Look at each answer choice. Both are only physical changes. Both changes are chemical changes. They are not physical changes. Both are chemical changes. Both changes are chemical changes. The type of matter before and after each change is different. Both are caused by heating. Neither change is caused by heating. Both are caused by cooling. Neither change is caused by cooling."
Not supported with pagination yet	"Which text uses the word literally in its traditional sense?"	[ "Cara adores the classic Renaissance style of the Rialto Bridge in Venice. She was surprised to learn that the bridge remains functional even though it is literally a million years old.", "Cara adores the classic Renaissance style of the Rialto Bridge in Venice. She was surprised to learn that the bridge remains functional even though it is literally hundreds of years old." ]	1	""	"closed choice"	"grade10"	"language science"	"writing-strategies"	"Word usage and nuance"	"Explore words with new or contested usages"	"Words change in meaning when speakers begin using them in new ways. For example, the word peruse once only meant to examine in detail, but it's now also commonly used to mean to look through in a casual manner. When a word changes in meaning, its correct usage is often debated. Although a newer sense of the word may be more commonly used, many people consider a word's traditional definition to be the correct usage. Being able to distinguish the different uses of a word can help you use it appropriately for different audiences. Britney perused her notes, carefully preparing for her exam. The traditional usage above is considered more standard. David perused the magazine, absentmindedly flipping through the pages. The nontraditional usage above is now commonly used, but traditional style guides generally advise against it."	"The second text uses literally in its traditional sense: in a factual, non-exaggerated way. Cara adores the classic Renaissance style of the Rialto Bridge in Venice. She was surprised to learn that the bridge remains functional even though it is literally hundreds of years old. The first text uses literally in its nontraditional sense: nearly or in effect (often exaggerated). The bridge is old, but it is not actually a million years old. Cara adores the classic Renaissance style of the Rialto Bridge in Venice. She was surprised to learn that the bridge remains functional even though it is literally a million years old. Most style guides recommend to avoid using the nontraditional sense of the word literally because it is generally considered incorrect."
Not supported with pagination yet	"Compare the motion of two fish. Which fish was moving at a higher speed?"	[ "a fish that moved 50kilometers in 10hours", "a fish that moved 85kilometers in 10hours" ]	1	""	"closed choice"	"grade2"	"natural science"	"physics"	"Force and motion"	"Compare the speeds of moving objects"	"An object's speed tells you how fast the object is moving. Speed depends on both distance and time. Distance tells you how far the object has moved. One unit used to measure distance is the kilometer. Time tells you how long the object has spent moving. One unit used to measure time is the hour. Think about two objects moving for the same amount of time. The object that is moving faster will go a farther distance in that time. It is moving at a higher speed."	"Look at the distance each fish moved and the time it took to move that distance. One fish moved 85 kilometers in 10 hours. The other fish moved 50 kilometers in 10 hours. Notice that each fish spent the same amount of time moving. The fish that moved 85 kilometers moved a farther distance in that time. So, that fish must have moved at a higher speed."
	"Which of these states is farthest east?"	[ "Montana", "New Mexico", "Arkansas", "Nebraska" ]	2	""	"closed choice"	"grade2"	"social science"	"geography"	"Geography"	"Read a map: cardinal directions"	"Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map."	"To find the answer, look at the compass rose. Look at which way the east arrow is pointing. Arkansas is farthest east."
	"Will these magnets attract or repel each other?"	[ "repel", "attract" ]	1	"Two magnets are placed as shown. Hint: Magnets that attract pull together. Magnets that repel push apart."	"closed choice"	"grade2"	"natural science"	"physics"	"Magnets"	"Identify magnets that attract or repel"	"Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles, called north and south. Here are some examples of magnets. The north pole of each magnet is marked N, and the south pole is marked S. If different poles are closest to each other, the magnets attract. The magnets in the pair below attract. If the same poles are closest to each other, the magnets repel. The magnets in both pairs below repel. "	"Will these magnets attract or repel? To find out, look at which poles are closest to each other. The north pole of one magnet is closest to the south pole of the other magnet. Poles that are different attract. So, these magnets will attract each other."
Not supported with pagination yet	"Which sentence is more formal?"	[ "People who did not grow up playing or watching cricket often find it difficult to understand the rules of the sport.", "People who didn't grow up playing or watching cricket often can't understand the rules of the sport." ]	0	""	"closed choice"	"grade7"	"language science"	"writing-strategies"	"Author's purpose and tone"	"Which sentence is more formal?"	"Formal writing is used for essays, business letters, and reports. The following types of informal language should be avoided in formal writing: Type \| Examples slang \| cool, awesome idioms \| knock your socks off conversational language \| gonna, kinda, yeah abbreviated language \| ASAP, FYI overly simple or imprecise language \| he got some stuff at the store contractions \| can't, won't Contractions are not as informal as the other types, but they should be used sparingly in formal writing. Compare the following sentences. The first is informal. The second is formal. Informal: Yeah, ostriches can't fly, but they're awesome runners. Formal: Though ostriches are flightless, they are remarkably adept runners. "	"The first sentence is less formal. You can tell because it uses contractions (don't, can't). The second sentence does not use contractions, so it is more formal."
Not supported with pagination yet	"Would you find the word pig on a dictionary page with the following guide words? pardon - polish"	[ "no", "yes" ]	1	""	"yes or no"	"grade8"	"language science"	"reference-skills"	"Reference skills"	"Use guide words"	"Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order. To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second letters. If the second letters are the same, look at the third letters, and so on. If one word is shorter, and there are no more letters to compare, then the shorter word comes first in alphabetical order. For example, be comes before bed."	"Put the words in alphabetical order. Since pig is between the guide words pardon - polish, it would be found on that page."
	"Which country is highlighted?"	[ "Saint Lucia", "Grenada", "Haiti", "Cuba" ]	2	""	"closed choice"	"grade7"	"social science"	"geography"	"The Americas: geography"	"Identify and select countries of the Caribbean"	""	"This country is Haiti. Does Haiti have any territorial disputes? Haiti claims to own Navassa Island, which is a disputed territory. In other words, multiple countries or groups claim that the area rightfully belongs to them. Navassa Island is also claimed by the United States. The United States claimed the island in 1857 and has controlled it since then. But Haiti considers the island part of its territory and has protested the United States' claim since this time. No one lives on the island. Today, it is a nature preserve."
	"What is the name of the colony shown?"	[ "New Jersey", "Virginia", "West Virginia", "Indiana" ]	1	""	"closed choice"	"grade8"	"social science"	"us-history"	"Colonial America"	"Identify the Thirteen Colonies"	""	"The colony is Virginia. The Virginia Colony included land that would later become part of the state of West Virginia. West Virginia was never its own colony."
Not supported with pagination yet	"What does the verbal irony in this text suggest? "This is the best day of my life," Mr. Hogan mumbled after his car broke down on the way to an important job interview."	[ "Mr. Hogan was having a bad day.", "Mr. Hogan liked fixing cars." ]	0	""	"closed choice"	"grade6"	"language science"	"figurative-language"	"Literary devices"	"Interpret figures of speech"	"Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive. Verbal irony involves saying one thing but implying something very different. People often use verbal irony when they are being sarcastic. Olivia seems thrilled that her car keeps breaking down. Each breakdown is as enjoyable as a punch to the face."	"The text uses verbal irony, which involves saying one thing but implying something very different. The best day of my life ironically suggests that Mr. Hogan was having a bad day. He was having the opposite of a good day because his car broke down when he needed to be on time."
	"Which of the following could Cody's test show?"	[ "how well the weather station would work when it was windy", "if the weather station would work when the temperature was 50°C" ]	1	"People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. The passage below describes how the engineering-design process was used to test a solution to a problem. Read the passage. Then answer the question below. Cody was a mechanical engineer who was designing to record temperature, precipitation, and wind speed. The weather station would be used in a town where the highest recorded temperature was 40°C. Cody wanted to make sure the weather station would work even in unusually warm weather. So, he set an indoor test chamber to 50°C with low moisture and no wind. He left the weather station in the chamber overnight. The next day, he checked to see if the weather station displayed accurate measurements after 24 hours at 50°C. Figure: a weather station."	"closed choice"	"grade6"	"natural science"	"science-and-engineering-practices"	"Engineering practices"	"Evaluate tests of engineering-design solutions"	"People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured. Imagine an engineer needs to design a bridge for a windy location. She wants to make sure the bridge will not move too much in high wind. So, she builds a smaller prototype, or model, of a bridge. Then, she exposes the prototype to high winds and measures how much the bridge moves. First, identify what was tested. A test can examine one design, or it may compare multiple prototypes to each other. In the test described above, the engineer tested a prototype of a bridge in high wind. Then, identify what the test measured. One of the criteria for the bridge was that it not move too much in high winds. The test measured how much the prototype bridge moved. Tests can show how well one or more designs meet the criteria. The test described above can show whether the bridge would move too much in high winds."	""
Not supported with pagination yet	"Which is a complete sentence?"	[ "In summer, insects always fly around the pond.", "A bag of beans." ]	0	""	"closed choice"	"grade3"	"language science"	"writing-strategies"	"Sentences, fragments, and run-ons"	"Is it a complete sentence, a fragment, or a run-on?"	"A sentence is a group of words that forms a complete thought. It has both a subject and a verb. My friends walk along the path. A sentence fragment is a group of words that does not express a complete thought. It is usually missing a subject or a verb. Knows the answer. This is a sentence fragment. It is missing a subject. Who knows the answer? She knows the answer. The bright red car. This is a sentence fragment. It is missing a verb. What did the bright red car do? The bright red car stopped. A run-on sentence is made up of two sentences that are joined without end punctuation or with just a comma. I knocked on the door it opened. It started raining, we ran inside. To fix a run-on sentence, separate it into two sentences. Add end punctuation after the first sentence, and capitalize the second sentence. I knocked on the door. It opened. It started raining. We ran inside. You can also fix a run-on sentence by rewriting it as a compound sentence. A compound sentence is two sentences joined by a comma and a conjunction such as and, but, or, or so. I knocked on the door, and it opened. It started raining, so we ran inside."	"In summer, insects always fly around the pond is a complete sentence. The subject is insects, and the verb is fly."
	"Select the chemical formula for this molecule."	[ "H2F", "H2F2", "HF", "HF2" ]	2	""	"closed choice"	"grade7"	"natural science"	"chemistry"	"Atoms and molecules"	"Identify chemical formulas for ball-and-stick models"	"Every substance around you is made up of atoms. Atoms can link together to form molecules. The links between atoms in a molecule are called chemical bonds. Different molecules are made up of different chemical elements, or types of atoms, bonded together. Scientists use both ball-and-stick models and chemical formulas to represent molecules. A ball-and-stick model of a molecule is shown below. The balls represent atoms. The sticks represent the chemical bonds between the atoms. Balls that are different colors represent atoms of different elements. The element that each color represents is shown in the legend. Every element has its own abbreviation, called its atomic symbol. Every chemical element is represented by its own symbol. For some elements, that symbol is one capital letter. For other elements, it is one capital letter followed by one lowercase letter. For example, the symbol for the element boron is B and the symbol for the element chlorine is Cl. The molecule shown above has one boron atom and three chlorine atoms. A chemical bond links each chlorine atom to the boron atom. The chemical formula for a substance contains the atomic symbol for each element in the substance. Many chemical formulas also contain subscripts. A subscript is small text placed lower than the normal line of text. Each subscript in a chemical formula is placed after the symbol for an element and tells you how many atoms of that element that symbol represents. If there is no subscript after a symbol, that symbol represents one atom. So, the chemical formula for a substance tells you which elements make up that substance. It also tells you the ratio of the atoms of those elements in the substance. For example, the chemical formula below tells you that there are three chlorine atoms for every one boron atom in the substance. This chemical formula represents the same substance as the ball-and-stick model shown above."	"H is the symbol for hydrogen. According to the legend, hydrogen atoms are shown in light gray. F is the symbol for fluorine. According to the legend, fluorine atoms are shown in light green. This ball-and-stick model shows a molecule with one hydrogen atom and one fluorine atom. The chemical formula will contain the symbols H and F. There is one hydrogen atom, so H will not have a subscript. There is one fluorine atom, so F will not have a subscript. The correct formula is HF. The diagram below shows how each part of the chemical formula matches with each part of the model above."
Not supported with pagination yet	"Which metal paper clip has less thermal energy?"	[ "the colder metal paper clip", "the hotter metal paper clip" ]	0	"Two metal paper clips are identical except for their temperatures."	"closed choice"	"grade6"	"natural science"	"physics"	"Thermal energy"	"How are temperature and mass related to thermal energy?"	"Matter is made of tiny particles called atoms. Atoms are always moving. The energy of moving atoms is called thermal energy. The total amount of thermal energy in matter depends on three things: the type of matter, the amount of matter, and how fast the atoms are moving. Temperature measures how hot or cold matter is. If the atoms in matter slow down, the temperature goes down. The matter now has both less thermal energy and a lower temperature. What happens if the amount of matter changes? A 2-kilogram brick at 70°F has twice as much thermal energy as a 1-kilogram brick at 70°F. The two bricks have the same temperature, but the larger brick has twice as many atoms. So, it has twice as much thermal energy."	"The two metal paper clips are made of the same material and have the same mass. So, the colder metal paper clip has less thermal energy."
	"During this time, thermal energy was transferred from () to ()."	[ "each aquarium . . . the surroundings", "the surroundings . . . each aquarium" ]	0	"Two identical aquariums were next to an open window. One aquarium had a plastic cover on it, and the other was uncovered. This table shows how the temperature of each aquarium changed over 1.5hours."	"closed choice"	"grade7"	"natural science"	"physics"	"Thermal energy"	"Compare thermal energy transfers"	"A change in an object's temperature indicates a change in the object's thermal energy: An increase in temperature shows that the object's thermal energy increased. So, thermal energy was transferred into the object from its surroundings. A decrease in temperature shows that the object's thermal energy decreased. So, thermal energy was transferred out of the object to its surroundings."	"The temperature of each aquarium decreased, which means that the thermal energy of each aquarium decreased. So, thermal energy was transferred from each aquarium to the surroundings."
Not supported with pagination yet	"Complete the sentence so that it uses personification. "You might think you'll always be young," Mrs. Hensley counseled, "but time ()"."	[ "creeps up on you", "affects everyone" ]	0	""	"closed choice"	"grade8"	"language science"	"writing-strategies"	"Creative techniques"	"Use personification"	"Personification is giving human characteristics to nonhuman things. It is a figure of speech that can be used to make writing more interesting or to emphasize a point. The trees danced in the wind. The word danced describes the trees as if they were people. Unlike people, however, trees can't actually dance. Instead, the personification suggests that the trees are moving."	"Complete the sentence with the phrase creeps up on you. It describes time as if it were a sneaky person."
	"What is the capital of Texas?"	[ "Dallas", "Atlanta", "Salem", "Austin" ]	3	""	"closed choice"	"grade4"	"social science"	"geography"	"State capitals"	"Identify state capitals of the Southeast"	""	"Austin is the capital of Texas."
Not supported with pagination yet	"Which tense does the sentence use? Scientists will measure the rainfall in Greenville."	[ "present tense", "past tense", "future tense" ]	2	""	"closed choice"	"grade4"	"language science"	"verbs"	"Verb tense"	"Is the sentence in the past, present, or future tense?"	"Present tense verbs tell you about something that is happening now. Most present-tense verbs are regular. They have no ending, or they end in -s or -es. Two verbs are irregular in the present tense, to be and to have. You must remember their forms. Past tense verbs tell you about something that has already happened. Most past-tense verbs are regular. They end in -ed. Some verbs are irregular in the past tense. You must remember their past-tense forms. Future tense verbs tell you about something that is going to happen. All future-tense verbs use the word will. Present \| Past \| Future walk, walks \| walked \| will walk go, goes \| went \| will go"	"The sentence is in future tense. You can tell because it uses will before the main verb, measure. The verb tells you about something that is going to happen."
	"Which of these cities is marked on the map?"	[ "New York City", "Philadelphia", "Pittsburgh", "Washington, D.C." ]	3	""	"closed choice"	"grade4"	"social science"	"geography"	"Cities"	"Cities of the Northeast"	""	"The city is Washington, D.C. Pittsburgh, New York City, and Philadelphia are marked with gray circles on the map below."

Dataset Card Creation Guide

Dataset Summary

Learn to Explain: Multimodal Reasoning via Thought Chains for Science Question Answering

Supported Tasks and Leaderboards

Multi-modal Multiple Choice

Languages

English

Dataset Structure

Data Instances

Explore more samples here.

{'image': Image,
 'question': 'Which of these states is farthest north?',
 'choices': ['West Virginia', 'Louisiana', 'Arizona', 'Oklahoma'],
 'answer': 0,
 'hint': '',
 'task': 'closed choice',
 'grade': 'grade2',
 'subject': 'social science',
 'topic': 'geography',
 'category': 'Geography',
 'skill': 'Read a map: cardinal directions',
 'lecture': 'Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.\nA compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.\nThe north arrow points to the North Pole. On most maps, north is at the top of the map.',
 'solution': 'To find the answer, look at the compass rose. Look at which way the north arrow is pointing. West Virginia is farthest north.'}

Some records might be missing any or all of image, lecture, solution.

Data Fields

image : Contextual image
question : Prompt relating to the lecture
choices : Multiple choice answer with 1 correct to the question
answer : Index of choices corresponding to the correct answer
hint : Hint to help answer the question
task : Task description
grade : Grade level from K-12
subject : High level
topic : natural-sciences, social-science, or language-science
category : A subcategory of topic
skill : A description of the task required
lecture : A relevant lecture that a question is generated from
solution : Instructions on how to solve the question

Note that the descriptions can be initialized with the Show Markdown Data Fields output of the Datasets Tagging app, you will then only need to refine the generated descriptions.

Data Splits

name: train
- num_bytes: 16416902
- num_examples: 12726
name: validation
- num_bytes: 5404896
- num_examples: 4241
name: test
- num_bytes: 5441676
- num_examples: 4241

Dataset Creation

Curation Rationale

When answering a question, humans utilize the information available across different modalities to synthesize a consistent and complete chain of thought (CoT). This process is normally a black box in the case of deep learning models like large-scale language models. Recently, science question benchmarks have been used to diagnose the multi-hop reasoning ability and interpretability of an AI system. However, existing datasets fail to provide annotations for the answers, or are restricted to the textual-only modality, small scales, and limited domain diversity. To this end, we present Science Question Answering (ScienceQA).

Source Data

ScienceQA is collected from elementary and high school science curricula.

Initial Data Collection and Normalization

See Below

Who are the source language producers?

See Below

Annotations

Questions in the ScienceQA dataset are sourced from open resources managed by IXL Learning, an online learning platform curated by experts in the field of K-12 education. The dataset includes problems that align with California Common Core Content Standards. To construct ScienceQA, we downloaded the original science problems and then extracted individual components (e.g. questions, hints, images, options, answers, lectures, and solutions) from them based on heuristic rules. We manually removed invalid questions, such as questions that have only one choice, questions that contain faulty data, and questions that are duplicated, to comply with fair use and transformative use of the law. If there were multiple correct answers that applied, we kept only one correct answer. Also, we shuffled the answer options of each question to ensure the choices do not follow any specific pattern. To make the dataset easy to use, we then used semi-automated scripts to reformat the lectures and solutions. Therefore, special structures in the texts, such as tables and lists, are easily distinguishable from simple text passages. Similar to ImageNet, ReClor, and PMR datasets, ScienceQA is available for non-commercial research purposes only and the copyright belongs to the original authors. To ensure data quality, we developed a data exploration tool to review examples in the collected dataset, and incorrect annotations were further manually revised by experts. The tool can be accessed at https://scienceqa.github.io/explore.html.

Annotation process

See above

Who are the annotators?

See above

Personal and Sensitive Information

More Information Needed

Considerations for Using the Data

Additional Information

Dataset Curators

Pan Lu1,3
Swaroop Mishra2,3
Tony Xia1
Liang Qiu1
Kai-Wei Chang1
Song-Chun Zhu1
Oyvind Tafjord3
Peter Clark3
Ashwin Kalyan3

From:

University of California, Los Angeles
Arizona State University
Allen Institute for AI

Licensing Information

Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)

Citation Information

Provide the BibTex-formatted reference for the dataset. For example:

@inproceedings{lu2022learn,
    title={Learn to Explain: Multimodal Reasoning via Thought Chains for Science Question Answering},
    author={Lu, Pan and Mishra, Swaroop and Xia, Tony and Qiu, Liang and Chang, Kai-Wei and Zhu, Song-Chun and Tafjord, Oyvind and Clark, Peter and Ashwin Kalyan},
    booktitle={The 36th Conference on Neural Information Processing Systems (NeurIPS)},
    year={2022}
}