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Home Q & A Board Biology-Related Homework Help General Biology
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lisa_lordes lisa_lordes
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7 years ago
If a pathogen penetrates nonspecific physical and chemical surface barriers, it breaks through the ________.
A) second line of defense
B) first line of defense
C) first and second lines of defense
D) third line of defense
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Biology of Humans: Concepts, Applications, and Issues

Biology of Humans: Concepts, Applications, and Issues


Edition: 5th
Authors:
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R.FrantR.Frant
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