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One very special feature in the earthworm Pheretima is that

1. fertilisation for eggs occurs inside the body
2. the typhlosole greatly increases the effective absorption area of the digested food in the intestine
3. the S-shaped setae embedded in the integument are the defensive weapons used against the enemies
4. it has a long dorsal tubular heart

Correct answer: the typhlosole greatly increases the effective absorption area of the digested food in the intestine

Solution

In Pheretima, the typhlosole is a dorsal internal fold of the intestine that increases the absorptive surface area, helping the worm absorb digested food more efficiently. The other options describe features that are either incorrect or not the distinctive special feature asked here.

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