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21 May, 03:37

Which of these is used in modern medicine to strengthen the body's immune system against harmful microorganisms? A. vaccines B. brain transplants C. aspirin D. surgical casts

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  1. 21 May, 03:59
    0
    A. Vaccines

    This is the only logical option out of the four choices/options.
  2. 21 May, 04:02
    0
    I think it is A i am not positive thou
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