Science

What is the tough outer layer of a seed called?

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Which of these best describes how light travels?
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What is it called when the Earth, Sun and Moon lie in a straight-line configuration?
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When did Panama move from South America to North America?
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What unit of mass is equal to a thousand grams?
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What university did astronomy and space science theorist Carl Sagan teach at?
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Which of these is a cause of water pollution?
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What graced the left shoulder of an Apollo astronaut's training suit?
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Colors other than white, black and the pure greys are known as what?
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