College Biology Quiz
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EVOLUTION & NATURAL SELECTION
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Scientists studying antibiotic resistance examined bacterial samples from hospitals that began using a new antibiotic in 2010. They found that 2% of bacteria were resistant in 2010, 15% were resistant in 2015, and 45% were resistant in 2020. However, when they examined bacterial samples from museums collected from the same region in 1950 (before any antibiotic use), they found that 1.8% were already resistant to this antibiotic. What does this evidence most strongly suggest about the evolution of antibiotic resistance?
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