Tsavage8704 Tsavage8704
  • 17-05-2017
  • Biology
contestada

Doctors have fought infections with penicillin for over 50 years. Recently, penicillin has not worked as well as before. Which of the following explanations can account for this observation?

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anonymous0690
anonymous0690 anonymous0690
  • 17-05-2017
Over the years illnesses have been harder to treat because they mutate and start to develop an immunity to drugs.
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