Question

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.

Answer 1

@_SebasQ

Answer 2

All involve the earth's atmosphere, the affect the earth's atmosphere and atmospheric conditions, pollutants, changing concentrations of water, carbon (dioxide) and nitrogen in the air affect the cycles.

So I think it'd be A :)

Answer 3

Thank You (: