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 1Briefly describe the three lines of defense used by the body to combat pathogens and give one example of eachDQ 2Differentiate between humoral and cell-mediated immunity (CMI)