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9 April, 22:03

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

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  1. 9 April, 22:09
    0
    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)
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