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.

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.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.

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