Phytoplankton play an important role in which of the following biogeochemical cycles?

A.) the nitrogen cycle

B.) the phosphorus cycle

C.) the carbobon cycle

I think the correct answer from the choices listed above is option C. Phytoplankton play an important role in the carbon cycle. These organisms are known to be crititcal in regulating the carbon cycle. These organisms consume carbon dioxide from the atmosphere moving it to marine sediments deep in the ocean.