Question

Which statement best compares coral reef ecosystems to demersal ecosystems? Coral reef ecosystems have high levels of nutrients in the water, and demersal ecosystems do not.

Coral reef ecosystems are typically in shallow water, and demersal ecosystems can exist at any depth.
Coral reef ecosystems can support large fish like sharks and rays, and demersal ecosystems cannot.
Coral reef ecosystems may have starfish, clams, and other invertebrates, and demersal ecosystems have only fish.

Answer 1

The best comparison between the coral reef ecosystem to the Demerol ecosystem is: Coral reef ecosystems may have starfish, clams, and other invertebrates, and Demerol ecosystems have only fish.The Demerol zone is located near the bottom of the sea or ocean. It is above the Bentham zone and is only inhabited by two types of fish. These are the fishes that are too heavier than water and needs to rest on the seabed and those that can stay just above the substrate due to its neutral buoyancy.

Answer 2

I just took the test and the correct answer was B. Coral reef ecosystems are typically in shallow water, and demersal ecosystems can exist at any depth.