1) in coelenterates, cells are differentiated, but unlike flatworms, they do not have tissues and organs;
2) two-layer coelenterates, and three-layer flatworms;
3) the nervous system of coelenterates of a diffuse (reticular) structure, and of flatworms – of a stem (ladder);
4) coelenterates have radial (radial) symmetry, and flatworms have bilateral (bilateral) symmetry.
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