What features that facilitate diffusion of respiratory gases are shared by all animals with some type of respiratory system?

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    The surface across which the exchange of respiratory gases is made is exceedingly thin.
    The respiratory surface is always moist.
    The respiratory surface is very big.
    The respiratory surface is an internal lung.
    all of the above
    The first three answers are all correct.

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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The first three answers are all correct.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)



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