Biology (11th Edition)

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

Chapter 51 - The Immune System - Review Questions - Apply: 1

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.
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