Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 7 - Engage - Page 148: 4

Answer

4. Barrier defenses are supposed to prevent pathogens from getting into the body. They act like walls to keep the unwanted or dangerous elements out.

Work Step by Step

There is a wall at the Mexican-US border but it is not an effective barrier defense.
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