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  3. Unit 5. animal structure and
  4. The immune system and disease
  5. Innate immunity

17.2 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, Concepts of biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11487/1.9
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