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Reef-building corals, also known as hermatypic corals, are marine invertebrates belonging to the phylum Cnidaria and class Anthozoa. They are primarily responsible for forming coral reefs, which are highly diverse and productive marine ecosystems. These corals have a symbiotic relationship with _______ ___ _____ ______ __________ _____ ____ _____ ________ __________ _________.
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