A is the oxygen and B is the carbon dioxide.
As shown in the diagram, the oxygen is taken in by fish and given out by plants. The carbon dioxide is taken in by plants and released by fish. Photosynthesis allows the plants to supply oxygen to fish and take out the carbon dioxide to provide a stable ecosystem for the fish. If there is too much carbon dioxide, then the fish will die due to the lack of oxygen. Therefore, photosynthesis benefits an aquatic ecosystem by balancing the oxygen and carbon dioxide levels in water. Go photosynthesis!
-turtle rooter
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