Phylum Coelenterata (now Cnidaria) is characterized by the presence of a gastrovascular cavity, also called a coelenteron, and stinging cells called nematocysts (or cnidocytes). These are simple, aquatic animals, including jellyfish, corals, and sea anemones, which are diploblastic with tissue-grade organization.
Phylum Coelenterata is characterized by the presence of _____?
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