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

D. must rely on other means than photosynthesis. Because sunlight is inadequate at the bottom of the sea, photosynthesis cannot take place. There are no plants and food is scarce; usually decaying matter from dead organisms. Organisms in the bottom of the sea relies on chemicals from hydrothermal vents to create their own food through chemosynthesis.