Q.

Ascaris 

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a

lacks a body cavity

b

has a body cavity lined with peritoneum

c

has a body cavity not lined with peritoneum

d

has a body cavity lined with endoderm

answer is C.

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Detailed Solution

Ascaris is a pseudocoelomate. Pseudocoelomates have a body cavity not lined by mesodermal peritoneum. Acoelomates (e.g., Taenia) lack a body cavity.

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Ascaris