tell me the answer of what are corals?
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Coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in groups. Wikipedia
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a coral reef is an underwater ecosystem characterized by reef building corals . reefs are formed of colonies of coral Polyps held together by calcium carbonate . most corals reefs are built from stony corals , whose polyps cluster in groups
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