Which statement/s show/s the importance of the processes of photosynthesis in our ecosystem? I. It is the number one source of oxygen and carbon dioxide in the atmosphere.
II. It contributes to the carbon cycle between the earth, the oceans, plants, and animals.
III. It contributes to the symbiotic relationship between plants, humans, and animals.
IV. It allows all living cells to extract energy in the form of ATP from food and offer that energy for the vital processes of life.

Select one:

a. I and II
b. I and IV
c. II and III
d. III and IV