Science

When did Panama move from South America to North America?

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What is the sun mostly made up of?
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Who was the first U.S. woman astronaut?
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Which of these has a lens?
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Which branch of science did young Carl Sagan tell his grandfather he wanted to practice?
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What is the scientific term for the cells responsible for root growth?
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Which song was used to wake up the first Space Shuttle crew in orbit?
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Which of these measurements of distance is the longest?
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When a dog repeats a learned behavior and gets a reward, what process is shown?
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