(D) Corals belong to the phylum $Cnidaria$ (also known as $Coelenterata$). They are marine invertebrates that typically live in large colonies. These

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Cnidarians that live in colonies

(D) Corals belong to the phylum $Cnidaria$ (also known as $Coelenterata$). They are marine invertebrates that typically live in large colonies. These colonies secrete calcium carbonate to form hard,protective skeletons,which eventually build up to form coral reefs.