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 - Understand: 2

Answer

A.

Work Step by Step

The other answer choices are used in the immune system for regulating immune responses (B.), recognizing antigens (C.), and attacking invaders (D.).
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