Question

The diagram below represents part of the oxygen cycle.



Which two major biological processes involved in the oxygen cycle are represented in the diagram?
A.
photosynthesis and evaporation
B.
evaporation and precipitation
C.
photosynthesis and respiration
D.
respiration and precipitation

Answer 1

C. photosynthesis and respiration

Photosynthesis produces O2 (plants release oxygen), and respiration uses O2 (organisms consume oxygen and release CO2), so those two biological processes are the ones shown.