Science
What university did astronomy and space science theorist Carl Sagan teach at?
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What electronic device only allows current to flow in one direction?
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Which of the following energy sources do gardens rely on most for survival?
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What are many cells that form together to provide a certain function called?
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When did Panama move from South America to North America?
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Discovered by Alexander Fleming, what is now used to treat infections?
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What is defined as the average distance from the Earth to the Sun?
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