Any member of a group of simple marine animals that have a hollow body cavity, including jellyfish, corals, and sea anemones.
From Greek 'koilos' (hollow) + 'enteron' (intestine) + '-ate' (adjective suffix). The term describes the defining characteristic of these animals' body structure.
A coelenterate's nervous system is so simple that jellyfish have no brain—just a network of nerve cells that helps them sense light and touch.
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