9. How are flatworms and roundworms different from one another?, A. They are free living, B. They have one body opening, C. They live as parasites of other animals, D. They have a digestive tract with two body opening

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9. How are flatworms and roundworms different from one another?


A. They are free living
B. They have one body opening
C. They live as parasites of other animals
D. They have a digestive tract with two body opening​

Answer:

D

Explanation:

A flatworm has a thin, dorsoventrally flattened body. Roundworms are more cylindrical in shape and tapered to a fine point at one end. … Flatworms do not have this; their bodies, instead, are covered with cilia, hairlike growths.


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