Unlike life at the top of a body of water, life at the bottom of the body of water.

a. Is affected my temperature and nutrient availability.

b. Most relay another means than photosynthesis.

c. Receives much more exposure to light.

d. Performs much more photosynthesis

The major difference between the life on top and on the bottom of water is that very little light penetrates the bottom of water, meaning that light cannot be used as a source of energy. Consequently, life cannot rely on photosynthesis and it b. Most relay another means than photosynthesis.