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16 April, 19:09

What are the two most important processes in the cycling of oxygen in and out of the atmosphere?

a. weathering and erosion

b. evaporation and precipitation

c. photosynthesis and respiration

d. lightning fixation and fossil fuel emission

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Answers (1)
  1. 16 April, 19:35
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    C.

    It is C because photosynthesis uses CO2 to form O2 and respiration uses O2 to create CO2, both processes filter oxygen through the atmosphere.
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