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sammy [17]
3 years ago
5

in the early days of antibiotic use , penicillin and sulfonamide were used to successfully treat a variety of bacterial infectio

ns . 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 ?
Biology
1 answer:
Vladimir [108]3 years ago
8 0
This situation is best explained by the process of natural selection.
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