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19. Innate Immunity - Part 1 of 3

19. Innate Immunity - Part 1 of 3

19. Innate Immunity / Introduction to First-Line Defenses / Problem 5

Which of the following statements is true regarding the first line defenses?

A

They are part of the adaptive immune system.

B

They are always active and nonspecific.

C

They can remember specific pathogens.

D

They require prior exposure to be effective.

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