Science
What tool do people at sea use to measure distance with echoes?
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What type of circulatory system pumps blood into cavities instead of through vessels?
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What vascular plants do not have seed-bearing flowers or fruits?
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What is any picture of an object made with a mirror or lens called?
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Which is also called the "Root of Life" or "Man Root"?
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How long does it take for Saturn to rotate completely on its axis (a typical day)?
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Who was the commander of the first U.S. Space Shuttle mission?
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