One very special feature in the earthworm Pheretima is that : (a) fertilization of eggs occurs i...

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One very special feature in the earthworm Pheretima is that :
(a) fertilization of eggs occurs inside the body
(b) The typhlosole greatly increases the effective absorption area of the digested food in the intestine
(c) The S-shaped setae embedded in the integument are the defensive weapons used against the enemies
(d) It has a long dorsal tubular heart
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