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1. Large no. of air sacs: Very large surface area for gas diffusion2. Thin air sacs was: Reduce distance of diffusion of gases3. Moist inner surfaces of air sacs: O2 dissolved in water film for diffusion 4. Rich supply of capillaries: Allows rapid transport of gases to and away from air sacs// steep conc. gradient of gases between air sacs and blood can be maintained for efficient gas diffusion.

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