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16 February, 22:11

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. 17 February, 00:08
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    By the process of natural selection.
  2. 17 February, 00:52
    0
    By natural selection.
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