To what depth can photosynthetic organisms be distributed in seas and oceans? Why?

Photosynthetic organisms can be distributed to a depth of 200 meters. Because at deeper depths, photosynthetic organisms do not have enough light for photosynthesis, since light is absorbed by the water column.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.