Tsavage8704 Tsavage8704

17-05-2017
Biology

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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

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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