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31 October, 11:23

In the early days of antibiotic use, penicillin and sulfonamide were used to successfully treat a variety of bacterial infections. in later years stronger antibiotics were needed because some bacteria were either resistant to or not affected by these same antibiotics. this situation is best explained?

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  1. 31 October, 12:41
    0
    By the process of natural selection.
  2. 31 October, 14:36
    0
    By natural selection.
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