a)They are moist to dissolve the respiratory gas(oxygen)
b)Highly vascularized-they posses a rich network of blood capillaries into which the respiratory gas diffuses into.
c)They have a large surface area-this enables the diffusion of a large volume of the respiratory gas at a time.
d)They are thin-this enables the gases(oxygen and carbon (IV) oxide travel a short distance into and out of the respiratory surface.)
Mohaissack answered the question on October 5, 2017 at 11:53
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