In the ongoing processes of photosynthesis, respiration, and decomposition in the ocean, all components are recycled except

In the ongoing processes of photosynthesis, respiration, and decomposition in the ocean, all components are recycled except  energy. 
Nearly all photosynthesis in the ocean takes place in the sunlit upper layers, because the deeper , the less light is available.
The depth where the photosynthesis reaches its peak activity varies with the location and the season.

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