Answer
b.
Work Step by Step
Most insects breathe using a system of tracheal tubes that perform the function of gas exchange. Air flows into and out of these insects through openings called spiracles.
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 27, Animal Systems I - Assessment - 27.2 Respiration - Understand Key Concepts/Think Critically - Page 802: 9
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