How Do Plankton Participate In The Oxygen Cycle Apex?

How Do Plankton Participate In The Oxygen Cycle Apex? The ocean produces oxygen through the plants (phytoplankton, kelp, and algal plankton) that live in it. These plants produce oxygen as a byproduct of photosynthesis, a process which converts carbon dioxide and sunlight into sugars the organism can use for energy. What role does plankton play