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Biology · PYQ NEET UG 2026

हिन्दी

Sponges exchange $O_2$ with $CO_2$ by

  1. simple diffusion over their entire body surfaces
  2. moist cuticle
  3. tracheal tubes
  4. gills

Correct answer · Option 1

simple diffusion over their entire body surfaces

Explanation

Sponges, coelenterates, and flatworms exchange $O_2$ with $CO_2$ simply by diffusion over their entire body surface.
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