GENERAL BIOLOGY I >CUSTOM<
GENERAL BIOLOGY I >CUSTOM<
17th Edition
ISBN: 9781308795270
Author: Raven
Publisher: MCG CUSTOM
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Chapter 48, 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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