1 SEM ACC W/RAVEN CARDED
1 SEM ACC W/RAVEN CARDED
12th Edition
ISBN: 9781265486297
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 47, Problem 3A

Countercurrent flow systems do not occur in lungs because they

a. require oxygen suspended in flowing water.

b. are limited to fish.

c. only work in moving organisms.

d. cannot operate in the presence of carbon dioxide.

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