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1. What is the first line of defense against infection for the human body?

A. white blood cells
B. saliva
C. skin
D. red blood cells

User Jeffz
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1 Answer

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White Blood cells or WBC's are the cells of your immune system. They are your first defense in fighting off foreign invaders and infectious diseases.


-Medical Student (College Level)

User Andrzej Polis
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