Mollusca is differentiated from others by

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(D) The phylum $Mollusca$ is characterized by the presence of a soft body,which is typically unsegmented. The body is covered by a fleshy fold of the

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Mantle and nonsegmented body

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(D) The phylum $Mollusca$ is characterized by the presence of a soft body,which is typically unsegmented. The body is covered by a fleshy fold of the body wall known as the $mantle$ or $pallium$. This $mantle$ secretes a calcareous shell in most members. Therefore,the combination of a $mantle$ and a $nonsegmented$ body serves as a primary diagnostic feature to differentiate $Mollusca$ from other phyla.

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