Multiple Choice
Why does the immune system have macrophages,phagocytes,and natural killer cells?
A) in order to create a kind of immunological memory for a specific intruder
B) in order to fight off any foreign substance,including those never before encountered
C) in order to relay information to the brain that there is an infection
D) in order to be the first line of defense,catching dust,microbes,and other foreign matter before it penetrates the skin
Correct Answer:
Verified
Correct Answer:
Verified
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