BIOLOGY 12E CONNECT ACCESS CARD
BIOLOGY 12E CONNECT ACCESS CARD
12th Edition
ISBN: 9781264938513
Author: Raven
Publisher: MCG
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Chapter 47, Problem 2U

Increased efficiency of gas exchange in vertebrates has been brought about by all of the following mechanisms except

a. cutaneous respiration.

b. unidirectional air flow.

c. crosscurrent blood flow.

d. cartilaginous rings in the trachea.

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