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Biology 18 Online
OpenStudy (anonymous):

Roundworms are _______. A. Cnidaria B. Nematoda C. Platyhelminthes D. Annelids

OpenStudy (petiteme):

B

OpenStudy (petiteme):

nematodes have tubular digestive systems with openings at both ends. Nematodes are obligate aquatic organisms consisting of cylindrical unsegmented worms.

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