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Cnidarians, which include jellyfish, corals, and sea anemones, exhibit two primary body forms: the polyp and the medusa. The polyp is a sessile, cylindrical form that attaches to a substrate, while the medusa is a free-swimming, bell-shaped form. Both forms have a gastrovascular cavity for digestion and specialized cells called cnidocytes that contain stinging structures. The life cycle of many cnidarians involves a transition between these two forms.

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