Answer
C
Work Step by Step
Option C is structure 4, which are the lungs. The lungs contain many tiny sacs called alveoli. These structures are where the actual exchange of oxygen and carbon dioxide occur.
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 33, Circulatory and Respiratory Systems - Standardized Test Prep - Page 975: 10
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