One very special feature in the earthworm (Pheretima) is that

Fertilisation is internal

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Long dorsal tubular heart

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The S-shaped setae embedded in the integument are the defensive weapons used against the enemies

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Typhlosole

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Solution

The correct option is D
Typhlosole

In earthworm, mid dorsal villi typhlosole greatly increases the effective absorption area of the digested food in the intestine.

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One special feature in earthworm, , is that

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