Which among the following does not have a true body cavity?

Mollusca

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Coelenterata

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Arthropoda

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Echinodermata

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Solution

The correct option is B Coelenterata
Cnidarians/coelenterates do not have a true body cavity to protect the organs within the body structure. Hence they are acoelomate animals.
Arthropods have coelomic cavity which is filled with blood.
Molluscs and Echinoderms have coelomic cavity.

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