Which of the following organisms belongs to Coelenterata (Cnidaria)?
- A.Planaria and liverfluke
- B.Sea urchin and sea cucumber
- C.Hydra and sea anemone
- D.Euplectella and sycon
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Both are cnidarians, simple aquatic animals with stinging cells. Members of phylum Coelenterata (Cnidaria) have radial symmetry, two body layers, a single opening that works as both mouth and anus, and stinging cells called cnidoblasts on their tentacles, used to catch prey and for defence.
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