The Undersea Environment of Coral Reefs

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Coral reefs are the most biologically diverse marine ecosystems on earth, rivaled only by

the tropical rainforests. They provide homes and nurseries for almost a million

fish and other species. Incredibly, coral reefs occupy only one quarter of one percent

of the earth's marine environment, yet they are home to more than a quarter of all

known fish species. Letâs take a look at these fascinating communities under

the sea that have been in existence for almost 200 million years.