How do earthworms exchange O₂ and CO₂?

How do earthworms exchange O₂ and CO₂?
  1. By simple diffusion over their entire body surface
  2. Through tracheal tubes
  3. By a moist cuticle
  4. By pumping water through a series of chambers

Solution

Earthworms use their moist cuticle to exchange O₂ and CO₂.

Asked in: NCERT

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