Science
What are plants that live for three or more years?
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When a dog repeats a learned behavior and gets a reward, what process is shown?
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Who discovered the supernova and was the first to theorize that stars "die"?
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What is a collection of different types of tissue to perform a specific function?
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Scott and Worden were crewmembers on which Apollo mission?
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Colors other than white, black and the pure greys are known as what?
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