Final answer:
The ocean zone on the ocean bottom is the benthic realm or abyssal zone, encompassing the ocean floor and settled sediments, and is a nutrient-rich environment supporting various marine life. Option A is the correct answer.
Step-by-step explanation:
The ocean zone found on the ocean bottom, which includes the ocean floor and the sediments that have settled on the bottom, is known as the benthic realm or zone.
This zone extends along the ocean bottom from the shoreline to the deepest parts of the ocean floor. It is characterized by sand, silt, and dead organisms, with a temperature that decreases with increasing water depth but remains above freezing.
The benthic realm is a nutrient-rich portion of the ocean because of the dead organisms that fall from the upper layers of the ocean, supporting a diversity of marine life including fungi, sponges, sea anemones, marine worms, sea stars, fishes, and bacteria.