Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 27, Animal Systems I - Assessment - 27.2 Respiration - Understand Key Concepts/Think Critically - Page 802: 11



Work Step by Step

Mollusks and fish actively pump water over their gills to maintain the concentration gradients of carbon dioxide and oxygen so that diffusion can take place.
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