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The first line of defense for keeping pathogens out of the body is the _____. A. skin B. antibodies C. immune system D. white blood cells
The first line of defense for keeping pathogens out of the body is the skin.
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Asked 5/17/2014 1:22:53 PM
Updated 5/17/2014 1:34:33 PM
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Confirmed by alfred123 [5/17/2014 1:34:33 PM]
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