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One very special feature in the earthworm pheretima is that 1. It has a long dorsal tubular heart 2. Fertilisation of eggs occurs inside the body 3. The typhlosole greatly increases the effective absorption area of the digested food in the intestine 4. The S-shaped setae embedded in the integument are the defensive weapons used against the enemies
Sol: In earthworm, mid dorsal villi typhlosole greatly increases the effective absorption area of the digested food in the intestine Answer: (3)
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