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19.1 Innate immunity  (Page 3/20)

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3 / 20  Which of the following is a barrier against pathogens provided by the skin?
A  low pH
B  mucus
C  tears
D  cilia
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Practice MCQ 3 FlashCards 2 Key Terms 13

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Source:  OpenStax, Human biology. OpenStax CNX. Dec 01, 2015 Download for free at http://legacy.cnx.org/content/col11903/1.3
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