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Body cavity is the cavity present between body wall and gut wall. In some animals the body cavity is not lined by mesoderm.Such animals are called
A. acoelomate
B. pseudocoelomate
C. coelomate
D. haemocoelomate

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Acoelomates are characterised by absence of coelom or body cavity while coelomates are those organisms where mesoderm lines the coelom. Pseudocoelomates are those, which have a body cavity (derived from blastocoel of embryo) but is not lined with mesoderm, e.g. roundworms.

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