Select the following phylum that includes animals that are unsegmented, acoelomate, and have a digestive cavity with a single opening.
A) Annelida
B) Platyhelminthes
C) Nematoda
D) Cnidaria
Correct Answer:
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A)spiral cleavage.
B)radial cleavage.
C)axial cleavage.
D)polar cleavage.
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