Which of the following provides a first line of defense against pathogens?

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01-03-2017
Biology

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Which of the following provides a first line of defense against pathogens?

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Аноним Аноним · Answer 1 · 2017-03-03T20:56:18+01:00

Аноним Аноним

03-03-2017

The first line of defense against disease is intact skin and mucous membranes. If an antigen (pathogen) cannot enter the body, a secondary defense is unnecessary.

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