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a
They have incomplete gut without anus.
b
Often females are longer than males among roundworms.
c
The body of round worms has distinctly marked segments.
d
They exhibit two basic body forms like polyp and medusa.
answer is B.
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Detailed Solution
In round worms, often females are longer than males.Incomplete gut is found in flatworms.Metamerism (segments) made its appearance in annelidsPolyp and medusa forms are observed in cnidarians.