![]() Most reefs grow best in warm, shallow, clear, sunny and agitated water. Unlike sea anemones, corals secrete hard carbonate exoskeletons that support and protect the coral. Most coral reefs are built from stony corals, whose polyps cluster in groups.Ĭoral belongs to the class Anthozoa in the animal phylum Cnidaria, which includes sea anemones and jellyfish. Reefs are formed of colonies of coral polyps held together by calcium carbonate. ![]() A coral reef is an underwater ecosystem characterized by reef-building corals.
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