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Q.

Which of the following lacks a body cavity?

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a

Cucumaria

b

Wuchereria

c

Hirudinaria

d

Planaria

answer is A.

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Detailed Solution

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Planaria is an acoelomate included under the phylum Platyhelminthes. Like the other flatworms,  lacks a body cavity. The space between the body wall and the gut is filled with parenchyma.

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