(i) To reduce the thickness of the epithelial lining making tracheoles permeable to respiratory gases reduces the distance to be covered by respiratory gases increasing rate of diffusion.
(ii) For efficient gases exchange muscular contraction of the floor of the mouth increases the volume and decrease the pressure in the mouth cavity forcing water to rush into mouth
johnmulu answered the question on May 4, 2017 at 05:58
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(Solved)
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