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Explain why there has been a large increase in antibiotic-resistant strains of bacteria.

An overuse of antibiotics means the non-resistant strains are killed, leaving less competition for the resistant-strains of bacteria, so they can mutate to reproduce more resistant strains of bacteria.

Answered by Anna M. • Biology tutor

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Explain why there has been a large increase in antibiotic-resistant strains of bacteria.

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