Cnidarians evolved directly from which group? A. sponges B. multicellular choanoflagellates C. flatworms D. animals with bilateral symmetry
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They are characterized by their radial symmetry and the presence of specialized stinging cells called cnidocytes. Sponges (A) are a more primitive group of animals that lack true tissues and organs. They are not considered to be the direct ancestors of Show more…
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