Which of the following represents an evolutionary adaptation that terrestrial animals have to aid in improving the efficiency of their respiratory systems?

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    moisten the respiratory exchange surface only when necessary
    keep the respiratory exchange surfaces outside the body to expose them to the oxygen in the air
    development of complex internal lungs with massive amounts of surface area for gas exchange
    thicken the membrane lining the body surface to reduce water loss and promote the diffusion of gases through the skin

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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development of complex internal lungs with massive amounts of surface area for gas exchange
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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