A) flatworm
B) roundworm
C) segmented worm
D) mollusk
Correct Answer: A
Solution :
Flatworms are acoelomate invertebrates, characterised by flattened unsegmented body. The simple nervous system shows some concentration of cells at the head end. The mouth leads to a simple branched gut without an anus. Flatworms are hermaphrodite but self-fertilisation is unusual.
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