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Barriers To Pathogens

Barriers To Pathogens

Barriers that keep out pathogens are the body’s first line of defense. The first line of defense includes mechanical, chemical, and biological barriers.

CK-12 (High School)

ESSENTIAL QUESTION:

How does the body protect itself from illnesses?
STANDARDS:
RST.2 - Main Ideas

DEPTH OF KNOWLEDGE (DOK) LEVELS:

1,2
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