Q.

Pseudocoelomates 

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a

lack a body cavity

b

lack body cavity and mesoderm

c

have a body cavity lined by mesoderm

d

have mesoderm that does not line the body cavity

answer is A.

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Detailed Solution

In pseudocoelomates, the body cavity is not lined by mesoderm, instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm. 

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