How does a ribbon worm differ from a flatworm?
A. A flatworm has a complete digestive system.
B. Flatworms are deuterostomes.
C. Flatworms are radially symmetrical and ribbon worms are bilaterally symmetrical.
D. A ribbon worm has a mouth and an anus.
Answer: D
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The cells that comprise pseudostratified epithelium occur in layers
____________________ Indicate whether the statement is true or false.