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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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Source:  OpenStax, Introductory biology - brescia university. OpenStax CNX. Dec 18, 2014 Download for free at http://legacy.cnx.org/content/col11735/1.1
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