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

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

Solution & Step-by-step Explanation

The innate immune system is non-specific and provides the first line of defense. It includes Natural Killer (NK) cells and phagocytic cells (macrophages/neutrophils) that can recognize and destroy broad classes of pathogens without prior exposure.

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Humans have acquired an immune system that produces antibodies to neutralize pathogens. Still 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 that can phagocytose and destroy microbes
D
provides passive immunity

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human health and diseaseimmunity

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