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- They are highly vascularised so as to take away diffused gases and maintain high concentration gradient ;
- They have a large surface area to increase the rate of diffusion ;
- They have a thin film of moisture to dissolve the gases for diffusion.
- They have thin walls to reduce distance of diffusion increasing the rate of diffusion.
sharon kalunda answered the question on May 24, 2019 at 09:47
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