Corals are marine organisms from the class Anthozoa and exist as small sea anemone-like polyps, typically in colonies of many identical individuals. Some corals are reef builders that are found in tropical oceans, which secrete calcium carbonate to form a hard skeleton...Corals can catch small fish and animals such as plankton using stinging cells on their tentacles, however these animals obtain most of their nutrients from photosynthetic unicellular algae. As a results, most corals depend on sunlight and grow in clear and shallow water, at depths shallower than 200 ft (60 meters).
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