Which characteristic is shared by cnidarians and flatworms? A. dorsoventrally fl

Question

Which characteristic is shared by cnidarians and flatworms? A. dorsoventrally flattened bodies B. radial symmetry a digestive system with a single opening D. a distinct head Mark true (T) or false (F) for the following statements: A. Cnidarians have a sessile medusa and a motile polyp body plan. B. Platyhelminthes have pseudocoeloms. C. Round worms differ from annelids in that they don't have segmented bodies. D. Crustaceans are mollusks. E. Echinoderms have bilateral symmetry during larva stage. F. Chordates have notochord, a structure dorsal to the nerve cord.

Explanation / Answer

17 answer is option c. Both cnidaria and platyhelminthes have a gastrovascular cavity as their digestive system which opens exteriorly as a single pore.

18 false. Polyps are sessile and medusa is motile

True

True

True

True

False. Notochord lies ventral to the neural tube

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