How do sponges exchange O₂ and CO₂?

How do sponges 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

Lower invertebrates like sponges, coelenterates, flatworms, etc, exchange O₂ with CO₂ by simple diffusion over their entire body surface.

Asked in: NCERT

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