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22 December, 05:41

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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Answers (1)
  1. 22 December, 09:40
    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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