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A sponge has no lungs or gills. It exchanges gases by:
ADiffusion over its body
BTracheal tube network
CA moist outer cuticle
DBook lung chambers
Answer & Solution
Correct answer: A. Diffusion over its body
1. Sponges are simple animals with no special organs.
2. Gases pass straight through the body surface.
3. That is simple diffusion over the whole body.
_Source: NCERT Class 11 Biology, Chapter 17, Breathing and Exchange of Gases._
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