The processes of photosynthesis, transpiration, evaporation, condensation, respiration, and
excretion are all involved in the cycling of
A.
water
B. nitrogen
C. carbon dioxide
D. sulfur

it's c. (to reduce the greenhouse effect/carbon gasses)

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong

answer; synapse;