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Corals are marine organisms from the class Anthozoa and exist as small sea anemone-like polyps, typically in colonies of many identical individuals. The group includes the important reef builders that are found in tropical oceans, which secrete calcium carbonate to form a hard skeleton.


Encyclopaedia Britannica (11th ed., vol. 10) (New York, NY: The Encyclopaedia Britannica Company, 1910)


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