One very special feature in the earthworm Pheretima is that

Biology · Class 11 · CBSEStructural Organisation in Animals

One very special feature in the earthworm Pheretima is that
  1. fertilization of eggs occurs inside the body
  2. the typhlosole greatly increases the effective absorption area of 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.

Answer

(B) the typhlosole greatly increases the effective absorption area of intestine

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