Question

Most animals that live in deep oceanic waters are

• A. tertiary consumers
• B. detritivores
• C. primary consumers
• D. secondary consumers

Answer 1

The correct option is B detritivores

Deep sea ecosystems depend on energy from other overlying ecosystems since there is no light for primary production to take place via photosynthesis.
They rely on dead organic matter (detritus) from the photic zone, where light penetrates and photosynthesis takes place. Detritus is the organic matter made up of dead plant and animal material. So most animals that live in deep oceanic water are detritivores.