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Question generated: Which object is the best conductor of electricity?

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Question generated: A scientist studies the remains of two extinct animals to learn more about how they lived. She determines that one animal was a carnivore and the other was an herbivore. Which of the following did the scientist most likely compare to make this conclusion?

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Question generated: How do traits of animals such as ear shape, nose shape, and hair color most often get passed to offspring?

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Students on two different school campuses are comparing the growth rate of grass three weeks after fertilizer has been applied. The same fertilizer and the same amount of water are used on both campuses. Which additional variable is most important to control when the results of the two investigations are compared?