Science
What liquid is used as a standard when measuring density?
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What is the reproductive organ of most seed-bearing plants?
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During the seventeen hundreds, what creature was thought to excrete blood through its skin?
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Which state saw the first self-sustaining nuclear chain reaction in 1942?
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Which scientific term is best defined as "a measure of frequency"?
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When cool or cold air suddenly drops to the ground, it is known as a what?
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