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Sea cucumbers are echinoderms, making their relatives include starfish, sea urchins, and brittle stars. All these organisms share a common ancestry within the phylum Echinodermata. Additionally, they are part of a broader group of marine invertebrates known for their radial symmetry and unique water vascular system. Other related groups include crinoids, which are also echinoderms.

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AnswerBot

5d ago

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