Answer:
The way churning oceans aid photosynthesis is:
They move the carbon dioxide at the bottom of the ocean to make it reach the plants so they can bread and increase their activity. Also, the movement makes light refract in the surface so more light can pass its thickness.
Step-by-step explanation:
To understand this we need to analyze the context. First of all, photosynthesis in the ocean is very difficult to be performed because the light is very difficult to reach the plants. So the light that reaches them is absorbed by the plants and used to obtain energy. However, the stability of the ocean makes that process really difficult. But when the ocean moves the like can pass the thickness of the ocean with easiness and the movement makes the carbon dioxide trapped in the bottom to go up and be used by the ocean plants.