Answer
D.
Work Step by Step
All of the non-specific defenses listed (A.-C.) are provided by the skin, making D. the best answer choice.
Biology (11th Edition)
by Raven, Peter; Johnson, George; Mason, Kenneth; Losos, Jonathan; Singer, Susan
Published by
McGraw-Hill Education
ISBN 10:
1259188132
ISBN 13:
978-1-25918-813-8
Chapter 51 - The Immune System - Review Questions - Apply - Page 1084: 1
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