Answer
d.
Work Step by Step
Options a., b., and c. are incorrect. All of these are defenses against pathogens; however, only option d., skin, is a widespread and nonspecific defense against pathogens.
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 35, Immune System and Disease - Assessment - 35.2 Defenses Against Infection - Understand Key Concepts/Think Critically - Page 1030: 10
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