Section: Reading

15) View Additional Information

Animals that live near the bottom of the sea are most likely to be carnivorous because:

they have developed sharp teeth and strong jaws with which to kill their prey.
plants that grow far below the surface are not edible.
animals cannot make their own food, so they eat each other.
most surface vegetation is eaten before it sinks to the bottom of the sea.

Explanation

Lines 17-21 explain that plants cannot grow in the undersea darkness and that dead and dying plants are eaten before they reach the bottom layers of ocean.