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s2008m [1.1K]
3 years ago
11

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
2 answers:
VikaD [51]3 years ago
5 0
By the process of natural selection.
Travka [436]3 years ago
5 0
By <span>natural selection.</span>
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