Question

The aphotic zone is

a. the ocean's dark lower layer where photosynthesis cannot occur
b. the sunlit upper layer of the ocean where photosynthesis occurs
c. on the bottom of lakes, streams, and oceans.
d. where benthos are found

Answer 1

The aphotic zone is a deep-ocean region starting at depths greater than 200 meters where sunlight is insufficient for photosynthesis, requiring organisms to use chemosynthesis or depend on falling organic material.

Step-by-step explanation:

The aphotic zone is the part of an ocean or a deep body of water where sunlight does not penetrate enough for photosynthesis to occur. It typically starts at depths greater than 200 meters and extends to the bottom of the ocean. In this region, producers cannot rely on sunlight and must either use chemosynthesis to create food or depend on organic material drifting down from the zones above where photosynthesis is possible.