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B
Copulation
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C
Formation of cocoon
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D
Copulation between two earthworm
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Solution
The correct option is C Formation of cocoon The clitellum is a thickened glandular and non-segmented section of the body wall near the head in earthworms that secrete a viscid sac in which eggs are deposited. To form cocoon for its eggs, the clitellum secretes a viscous fluid.