Life of the effector cells of immune system is

Options :
  1. a few days
  2. a few years
  3. a few months to whole life
  4. a few weeks to several years
Answer and Explanation :-

Answer: Option 1

Explanation:

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On this one long, blessed night we refused to worry, allowing only hopes and dreams for the future of the human race, held in the miniscule hands of these newborns.
-A.B. Shepherd Lifeboat