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Coelenterates are organisms which are radially symmetrical and have sac-like bodies with only one opening and tentacles with stinging structure. All coelenterates are mostly marine. Some of the examples are corals, sea anemone etc.
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Coelenterata is term encompassing two animal phyla, the Ctenophora and the Cnidaria. The name comes from the Greek "koilos", referring to the hollow body cavity common to these two phyla
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