Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 48 - The Respiratory System - Review Questions - Apply: 3

Answer

A.

Work Step by Step

B. is untrue since non-fish have gills with countercurrent exchange, and C. is untrue since a non-moving organism in flowing water could use countercurrent exchange. D. can be eliminated since carbon dioxide is always present when doing gas exchange.
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