PCu1te3rbygirl PCu1te3rbygirl

21-03-2017
Biology

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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

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ardobbs5 ardobbs5

29-03-2017

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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