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Our bodies first line of defense is made up of physical and chemical barriers that work on all pathogens. this is called:

Our bodies first line of defense is made up of physical and chemical barriers that work on all pathogens. this is called:
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Our bodies first line of defense is made up of physical and chemical barriers that work on all pathogens. this is called:

User Daniele
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Immune system

Hope this helped! (:
User AmineG
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