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13 May, 02:20

Penicillin (an antibiotic that kills some bacteria) came into widespread use in the 1940s. by the 1990s, several different species of bacteria were already resistant to the effects of penicillin, and it can no longer be used to treat certain diseases. what is the most likely explanation for this?

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  1. 13 May, 04:14
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    Just like the adaptation of humans and animals to the environment, the same also applies for bacteria and viruses.

    After so many years of Penicillin being used as the main anti-bacterial cure, bacteria formed resistance due to constant environmental presence.
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