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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 ?

User Gdoug
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2 Answers

7 votes
by natural selection.
User Undermind
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4 votes
by the process of natural selection.
User Marek Kondracki
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