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Biology 7 Online
OpenStudy (anonymous):

What do the carbon, oxygen, and nitrogen cycles all have in common? a. They all include an exchange of gases with the atmosphere. b. None of the cycles are biogeochemical cycles. c. They are all byproducts of photosynthesis. d. They all sustain life, but living organisms have no part in the cycle.

OpenStudy (anonymous):

option 'a'

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