Science

What is the opposite to ordinary matter called?

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Which of these is the best definition of a compound machine?
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What is condensed water falling from the atmosphere called?
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Earthmen first sent a spacecraft to which planet?
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Which of these is considered "work"?
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Where on the moon did people first land a spacecraft?
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What are produced in the anther of a flower?
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What is the art of growing a miniature tree or trees in a low-sided pot or tray?
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