Science
What is a space which is entirely devoid of matter called in science terms?
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How long, in kilometers, is the average single thread unwound from a silkworm cocoon?
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What is the irregular and instantaneous motion of air called?
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How many Earth years does it take Mars to go around the Sun?
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During the seventeen hundreds, what creature was thought to excrete blood through its skin?
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What part of a plant obtains food and water from the soil and provides support?
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