Arrange the three lines of defense from the first to the last

1 = Adaptive immune system
2 = Physical barriers
3 = Innate immune system



a. 1, 2, 3
b. 2, 1, 3
c. 2, 3, 1
d. 3, 1, 2
e. 3, 2, 1


ANSWER: c

Biology & Microbiology

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