Know something about Coral Reefs

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Do you know what is Coral Reef? Coral is the Living thing Occur in Sea. Hard Corals extract abundant Calcium from surrounding seawater and use this to create a hardened structure for protection and growth. Some species, during feeding a Coral Polyp will extend its tentacles out from its body and wave them in the water current where they encounter small fish. Many coral species reproduce once or twice each year....