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The balance of oxygen in Earth's atmosphere is maintained primarily by which two processes? A. photosynthesis and respiration B. outgassing and photosynthesis C. lightning and fixation by bacteria D. the
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The balance of oxygen in Earth's atmosphere is maintained primarily by which two processes?

A.
photosynthesis and respiration


B.
outgassing and photosynthesis


C.
lightning and fixation by bacteria


D.
the formation of carbonate rocks and outgassing

User Bazindrix
by
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1 Answer

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Answer:

D.the fornation of carbonate roack and outgassing

User Rico Herwig
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