Question

What is the source of oxygen in the epipelagic zone ?

Answer 1

-~90% of atmospheric oxygen is produced in the photic zone -Seasonal turnover leads to consistent oxygen levels --Phytoplankton, algae, photosynthetic organisms produce oxygen --Highly oxygen-rich, but nutrient-poor water.....:)

Answer 2

Producing organisms such as plant plankton, the oxygen is a waste gas of photosynthesis