The distinguishing features of a nematode are

Pseudocoelom and flame cells

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Pseudocoelom

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Flame cells and longitudinal muscle in the body wall

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Syncytial epidermis and diploblastic nature

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Solution

The correct option is B Pseudocoelom
Phylum Nematoda is the only phylum of the animal kingdom which has pseudocoelom and longitudinal muscle in their body wall. The Phylum Nematoda is included with a group of aquatic phyla known collectively as the pseudocoelomates. These animals have a body cavity (which developed from the embryonic blastocoel) that is not lined with mesoderm.

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