What role do plants have in the carbon-oxygen cycle?

a) They release oxygen into the air as a waste product of photosynthesis.
b) They release carbon dioxide into the air as a waste product of photosynthesis.
c) They absorb oxygen from the air to use during photosynthesis.
d) They do not have a role in the carbon-oxygen cycle.

Respuesta :

A. Plants release oxygen to the air for us to breathe.
A.They release oxygen into the air as a waste product of photosynthesis.
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