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Coral reefs are highly diverse marine ecosystems primarily built by colonial marine invertebrates called corals, which belong to the phylum Cnidaria, class Anthozoa. These corals secrete calcium carbonate to form rigid skeletons, creating the structural foundation of reefs. Coral reefs are often found in shallow, warm, and clear tropical waters, usually ________ __________ ___ ________ __________ _________.
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