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Which of these BEST describes why certain bacteria have become resistant to penicillin?

User Scarlz
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I just did this one, it is D, Penicillin was so heavily prescribed by doctors that it led to certain, more fit, strains of bacteria to be able to survive.

User Pavithra
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The answer is:
Penicillin was so heavily prescribed by doctors that it led to certain, more fit, strains of bacteria to be able to survive.

User Pollirrata
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