What happens in an aphotic zone of a body of water

Aphotic zone of a body of water refers to the part where almost no sunlight. With this condition of water, marine life is limited to species who does not light for survival. The aphotic area also is the basin of the dead organism that submerges from the photic part. Temperatures at these areas are also low. 

Ribonuclease activity is a type of nuclease that catalyzes the degradation of rna into small components.

The diaphragm is what i think ur talking about