Coral reefs are structures that have merged together into limestone. It consists of a collection of biological communities that make up one of the most diverse ecosystems in the world. Corals themselves are actually small immobile animals that belong to the group cnidaria. They sustain themselves by catching prey, such as small fish and planktonic animals, with their tentacles. Corals generally live in colonies. Together these colonies secrete a hard calcium carbonate skeleton, which is wha...


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