Science
Energy return of a radar signal after it has hit the target best fits which science term?
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What is the female reproductive cell of flowering plants?
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How long, in kilometers, is the average single thread unwound from a silkworm cocoon?
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What vascular plants do not have seed-bearing flowers or fruits?
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The term, "black hole", was named by American physicist, John Wheeler, in which year?
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What tool do people at sea use to measure distance with echoes?
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What is the maximum number of electrons possible in the 6th energy level?
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When we add two forces, what do we call the answer?
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In which constellation was the first double star observed?
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