Which statement about the deep ocean zone is true? a. plankton dominate this zone of the ocean. b. coral reefs are commonly found in this zone. c. organisms in this zone must be able to survive major changes in salinity. d. some organisms in this zone use chemicals for energy rather than sunlight.

D. some organisms in this zone use chemicals for energy rather than sunlight.

Explanation:

The deep ocean has NO sunlight... meaning that plankton and coral reefs cannot grow (they need sun) and the ocean has the same salinity through out so... D) because their is no sun and organisms receive energy from the sun and since there is no sun they need chemicals to make that energy