The coelenterates belong to animals leading a motionless or sedentary lifestyle. A feature of their structure is ray symmetry. The presence of such symmetry is associated with a way of life, it allows you to catch food and protect yourself from enemies from all sides. Examples of representatives are freshwater and marine hydra, coral polyps, anemones. This includes the scyphoid jellyfish, which spends part of its life cycle in the form of a polyp. Also, representatives of the type of flatworms, which again switched to an attached lifestyle (starfish, sea urchin).
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