Humans have an acquired immune system that produces antibodies to neutralize pathogens. Still,the innate immune system is present at the time of birth because it

  • A
    is very specific and uses different macrophages.
  • B
    produces memory cells for mounting a fast secondary response.
  • C
    has natural killer cells which can phagocytose and destroy microbes.
  • D
    provides passive immunity.

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