In the given chart,which layer of the A group | vedclass

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(B) In triploblastic animals,the body cavity or coelom is a cavity lined by the mesoderm. In acoelomates (like Platyhelminthes,represented by $A$),the

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Mesoderm

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(B) In triploblastic animals,the body cavity or coelom is a cavity lined by the mesoderm. In acoelomates (like Platyhelminthes,represented by $A$),the mesoderm is present as a solid mass between the ectoderm and endoderm,and no cavity is formed. However,the question asks about the layer that,if it were to decompose or split,would form a cavity. In the development of a true coelom,the mesoderm splits to form the coelomic cavity. Therefore,the mesoderm is the layer associated with the formation of the body cavity.

In the given chart,which layer of the $A$ group decomposes to form a cavity?

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