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It's possible that radial symmetry is not the ancestral condition for cnidarians, but rather that they originally had bilateral symmetry and then reverted to radial symmetry, similar to adult echinoderms. A taxonomic grouping called Bilateralacea, that included both (and only) cnidarians and echinoderms would be considered A. paraphyleticB. monophyleticC. polyphyleticD. biphyletic
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