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Which of these is an example of an adaptation for defense from predators?
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Which event is the best example of mechanical energy?
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John was using his mp3 player when it suddenly stopped working. What is the first thing John should do to try correcting the problem?
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Which action is most likely a learned behavior?
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A student uses a pH meter to measure the acidity of a water sample from a lake. For what purpose is the student most likely testing the water?
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What is a difference between mitosis and meiosis?
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Which equation is correctly balanced for hydrogen and oxygen reacting to form water?
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Students are designing kites to discover what type of kite flies the highest. Which is the most important to consider when designing a kite to fly high?
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Many school districts are placing dispensers of hand sanitizer in classrooms and computer labs. Which of the following is the most likely purpose of this practice?
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If a new organism were discovered, which of the following would most likely be used to classify it into the appropriate kingdom?
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Mrs. Tucker gives her class samples of different soil types. Which action best helps Tanisha identify each soil type?
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ARC-Challenge
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A group of students plans to build a model of a local pond habitat. Which model best represents an environment similar to a pond?
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What is the frequency of ocean waves that have a speed of 18 m/s and a wavelength of 50 m?
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ARC-Challenge
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Which causes the GREATEST change in a grassy field over time?
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The feathers of male goldfinches become brightly colored each spring. Which best describes why the color of the feathers changes each year?
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Why is it safer to look at the Moon than it is to look at the Sun?
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Young robins build the same kinds of nests their parents build even if the young birds have never seen their parents build a nest. This is an example of
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ARC-Challenge
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A signal from the brain to a muscle in the arm is transmitted by which structures?
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Students want to plant a lemon tree at their school, but the cold winter temperatures in Massachusetts would kill the tree. Which of the following is the best solution to this problem?
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Which measurement describes the motion of a rubber ball?
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ARC-Challenge
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Which statement describes how muscles work to allow a person to extend an arm from a curled position by straightening the elbow?
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ARC-Challenge
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All of the following are examples of erosion EXCEPT:
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ARC-Challenge
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Scientists have measured the rate of growth of the Atlantic Ocean basin to be about 2 to 3 cm per year. This type of activity coincides with the formation of ridges on the ocean floor. What is the most likely cause of this activity?
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ARC-Challenge
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As part of an experiment, an astronaut takes a scale to the Moon and weighs himself. The scale reads 31 pounds. If the astronaut has a mass of about 84 kilograms, which are the approximate weight and mass of the astronaut when standing on the Earth?
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ARC-Challenge
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Corn is widely being used in the United States to make ethanol for use in automobile fuel. How might the overproduction of corn negatively affect the environment?
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Light is refracted the least when passing through a
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ARC-Challenge
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Which of the following is an example of a form of energy?
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In which taxonomic group are organisms found that share the characteristic of storing hereditary material in a single loop of DNA?
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A snack consists of peanuts, sunflower seeds, raisins, almonds, and chocolate pieces. Which statement describes why this is a mixture?
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Two elements in the same group on the Periodic Table of the Elements are most similar in their
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Which of these human activities does not contribute to the extinction of species?
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Which behavior of a dog is the best example of a learned behavior?
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ARC-Challenge
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Two pieces of the same metal are placed on a table. The pieces of metal have the same density, mass, and texture. Which characteristic must be the ONLY difference between the two samples?
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ARC-Challenge
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Which of these is a nonliving thing?
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Helena investigates how enzymes are important to body processes. How is the role of enzymes in biochemical activity best explained?
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ARC-Challenge
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The day before the class is going to do a lab experiment, their teacher reminds them not to wear open shoes to school the next day. Which rationale best explains their teacher's request?
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ARC-Challenge
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If a solid object is taken from Earth far into space, which of the following measurements of the object will change most?
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ARC-Challenge
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A plant gets the energy it needs from the Sun. The plant uses about ten percent of the energy to carry on its life functions. The plant transfers approximately another ten percent of the energy to the consumers in a food chain. What happens to most of the remaining energy?
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ARC-Challenge
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It takes approximately 365 days for
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Which has the greatest effect on the color of a young eagle's eyes?
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Which fact is a benefit of airplanes?
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Which is most like the way a stem supports a flower?
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Which human activity will help decrease air pollution?
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To conserve the supply of nonrenewable resources, it is best to recycle
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Tigers and household cats are members of the same family; however, their sizes are vastly different. What is the cause of this difference?
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ARC-Challenge
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What makes solar energy different from most other energy that people use?
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How does acid rain most likely affect forests?
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Which of the following substances can be separated into several elements?
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Approximately how many times does the Moon revolve around Earth during one revolution of Earth around the Sun?
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ARC-Challenge
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How will a thriving grassland ecosystem most likely be affected by a drought?
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ARC-Challenge
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Margaret is running a full lap around a circular track. She is facing north when she starts. What direction will she be facing after she has completed half of a lap?
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Corn can be used to make ethanol, which is a fuel for some cars. What problem could be caused by the increased use of ethanol?
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ARC-Challenge
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Which type of water reservoir contains the largest volume of fresh water?
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Why are alternative fuels being used in some automobiles?
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What do water, aluminum, redwood trees, and valley quail all have in common?
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Newly discovered organisms are now classified based on DNA evidence. Which of the following is most helpful to a researcher classifying a newly discovered organism?
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As a heavy metal ball rolls down a hill, it goes faster and faster. Which statement is true?
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Which of the following statements best describes one way that the Moon is different from Earth?
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In whitetail deer, females seldom grow antlers. Which best explains why male whitetail deer grow antlers but females seldom grow antlers?
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ARC-Challenge
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Which items are needed to create a simple circuit?
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ARC-Challenge
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A student recorded the growth rate of plants grown in the presence of two different types of music. Plants grown in the presence of one type of music grew faster than the other plants. Before reporting a conclusion, which should the student most likely do?
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ARC-Challenge
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Which conclusion is best supported by a tree-growth ring that is much narrower than the other growth rings?
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ARC-Challenge
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Which process forced Nevada's mountain ranges upward over the past million years?
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ARC-Challenge
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Solar cells absorb energy from the sun. In order to use this energy to power household appliances, solar cells must convert the absorbed energy to
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ARC-Challenge
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Which event can cause a large rock to become soil over time?
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ARC-Challenge
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Many states require vehicles to be examined and to meet safety and pollution standards. What impact might vehicle inspections have on the environment?
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ARC-Challenge
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Some animals are very rare. For example, there are very few Siberian tigers. If the only Siberian tigers left are female, what will most likely happen?
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ARC-Challenge
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How many chromosomes are in a human sperm cell?
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ARC-Challenge
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The gametes of human males and females have the same number of chromosomes. Which best describes what happens to the chromosomes when typical male and female gametes combine to produce offspring?
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ARC-Challenge
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Which of these is a property of water that allows it to transport materials through the Earth system?
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The marsh willow herb is a plant native to the northeastern United States. It grows best in damp habitats. Which of the following environmental changes would most likely cause a decrease in the marsh willow herb population in an area?
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ARC-Challenge
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Which phrase does not describe asexual reproduction in organisms?
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Which conclusion should the students make from the information in the table?
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ARC-Challenge
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A student compared the speeds at which a large and a small marble rolled down an inclined plane. In order to make the findings more reliable, the student should
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ARC-Challenge
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Which function makes a plant cell different from an animal cell?
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ARC-Challenge
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Which of these animals is most likely to be found living and feeding on the forest floors of Virginia?
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ARC-Challenge
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What is a worldwide increase in temperature called?
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ARC-Challenge
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Constructive forces build a new mountain range. How will weathering and erosion change the features of the mountain range over time?
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ARC-Challenge
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A student poured water into a plastic tray. The student then put the tray into the freezer. What property of the water changed as the water froze?
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ARC-Challenge
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Inside cells, special molecules carry messages from the membrane to the nucleus. Which body system uses a similar process?
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ARC-Challenge
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Four identical candles are set on a safe surface and lit. One is covered with a small-sized jar, one is covered with a large-sized jar, and one candle is left in the open. A fourth lit candle is placed in a vacuum. Which candle will most likely stay lit the longest?
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ARC-Challenge
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Sodium, Na, is in the same group as
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Where will a sidewalk feel hottest on a warm, clear day?
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ARC-Challenge
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Giant redwood trees change energy from one form to another. How is energy changed by the trees?
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ARC-Challenge
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Alan is using cabbage juice to determine the relative pH of various household solutions. Which of these steps communicates the results of his investigation?
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ARC-Challenge
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Which resource when used causes the most pollution?
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ARC-Challenge
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Which food provides the most energy for the body in the shortest amount of time?
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ARC-Challenge
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In early 2003, the Human Genome Project identified the sequence of base pairs in the genes in human DNA. With all of this information, many of the functions of the genes are still unknown. Currently, scientists are studying many of these genes in order to learn more about them. What is the significance of this new genetic discovery?
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ARC-Challenge
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Screech owls have two color variations-red and grey. What advantage does the grey screech owl have over the red screech owl in a habitat that is made up of trees with dark-colored bark?
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ARC-Challenge
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A student is watching a local television weather report for Gloucester, Massachusetts. Which of the following is most likely included in this weather report?
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ARC-Challenge
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Which of the following human traits is least likely to be inherited?
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ARC-Challenge
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A ship leaks a large amount of oil near a coastal area. Which statement describes how the oil most likely will affect the coastal habitat?
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ARC-Challenge
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Cellular respiration results in the production of adenosine triphosphate (ATP) molecules for energy. The most efficient form of cellular respiration would result in the production of ATP along with which substances?
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ARC-Challenge
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Mara planted six pots of lettuce seeds. She placed three pots in a sunny area and three pots in a shaded area. She watered each pot the same and measured the growth of the lettuce. After Mara analyzes her data, what conclusion will it help her to make?
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ARC-Challenge
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In what way can bacteria be good for the human body?
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ARC-Challenge
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Cell membranes are described as selectively permeable. Four students were asked to explain what this means and provided the answers given below.Student 1: Cell membranes prevent all materials from entering the cell.Student 2: Cell membranes only provide structural support for the cell.Student 3: Cell membranes regulate which substances can enter and exit the cell.Student 4: Cell membranes allow water and water-soluble substances to enter the cell.Which student correctly identified the function of the selectively permeable membrane?
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ARC-Challenge
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Which of the following is a by-product of cellular respiration in animals?
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ARC-Challenge
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When you make soap bubbles, what is inside the bubbles?
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ARC-Challenge
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Which is considered a nonrenewable resource?
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ARC-Challenge
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Which of the following is the best evidence that an area of land was once covered by a glacier?
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ARC-Challenge
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