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Evolutionary innovation represented by nematodes

Describe the main evolutionary innovation represented by nematodes? What is the benefit of that innovation?

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The major evolutionary innovation of nematodes is the complete digestive system, with two openings (that is, anus and mouth). As the ingestion and the defecation processes can take place in distinct extremities of the digestive tube, beings with a complete digestive system contain the benefit of ingesting new food whereas residuals of already eaten food are still within the body and not yet removed.

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