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What do our bodies need from the air we breathe?

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How often does sunspot activity reach its lowest point?
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What are produced in the anther of a flower?
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What type of circulatory system pumps blood into cavities instead of through vessels?
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What space related item did Burt Rutan develop?
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What is the formal name for climate studies?
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Which scientific term means "curved inwards"?
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