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Briefly describe the three lines of defense used by the body to combat pathogens

Choose 1 of the following questions to answer by day 3 (Wednesday) and include 2 references (in APA format). Your post should be at least 250 words. Please remember to answer to 2 of your classmates’ discussions (on 2 separate days) by Saturday.  The reply to your classmates should be at least 100 words each.  The references are not included in the word count!
DQ 1
Briefly describe the three lines of defense used by the body to combat pathogens and give one example of each