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Ribbon-like acoelomates with bilateral symmetry are examples of _________ ? A. Cnidarians: jellyfish B. Platyhelminthes: flat worms C. Nemotoda: round worms D. Mollusca: mollusks E. Annelida: segmented worms

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Answer: flat worms is the answer

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B. Platyhelminthes: flat worms. They have 3 germ layer; Organ level organization; Sac body; Incomplete digestive system; there are 20,000 species of flatworm - free living, parasitic.
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