Coelom is lined on all sides by

Ectoderm

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Mesoderm

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Endoderm

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Ectoderm and endoderm

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Solution

The correct option is B Mesoderm
Animals which have a body cavity entirely lined by mesoderm are termed as coelomate animals.
These include the phyla Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordata and Chordata.
Coelom provides the space for evolution of complex organ systems and in some cases space for storage of gametes.
So, the correct option is 'Mesoderm'.

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