A coral reef is a complex ______ of calcium carbonate shells that are home to microbes,algae,invertebrates,and fishes.

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A coral reef is a complex ecosystem because it contains many different living and non-living components that interact with each other. It includes not only the coral themselves, but also the organisms that inhabit the reef, such as fish, algae, and microbes, as well as the physical and chemical elements of the water and substrate.

A Coral Reef Is a Complex ______ of Calcium Carbonate