Which statement is NOT correct about the roundworms?

A. Roundworms have a tube-within-a-tube body plan.
B. There are three layers of tissues in the body.
C. Roundworms have a smooth unsegmented outside body wall.
D. Roundworms are all parasitic.
E. There is an internal body cavity called a pseudocoelom.


Answer: D

Biology & Microbiology

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