Question

phytoplankton can increase the amount of dissolved oxygen in water through photosynthesis. what else is necessary for photosynthesis to occur?
a. sunlight
b. nutrients
c. carbon dioxide
d. all of the above

Explanation:

Photosynthesis in phytoplankton (or plants) requires sunlight (for energy), carbon dioxide (as a reactant), and nutrients (like minerals for growth and enzyme function). So all of sunlight, nutrients, and carbon dioxide are necessary.

Answer:

D. all of the above