Unlike life at the top of a body of water, life at the bottom of the body of water a. receives much more exposure to light. b. performs much more photosynthesis. c. is affected by temperature and nutrient availability. d. must rely on other means than photosynthesis.

The deepest layer of a water body like ocean, is called as benthic zone. it receives less light and the organisms depend upon temperature and nutrient availability, as they rely on debris, inorganic nutrients and other living beings. The organsims of benthiz zone are known as benthos.