Science

What is the tough outer layer of a seed called?

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What is it called when the Earth, Sun and Moon lie in a straight-line configuration?
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What kind of power do sailboats use?
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What percent of the Sun, by weight, is helium?
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In which constellation does the vernal equinox appear?
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A ramp is an example of which of these simple machines?
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Which of the following is not a planet in our solar system?
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If you are caught in a sudden heavy rainfall of a showery nature, you are caught in a what?
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What causes the moon to shine?
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