Middle School Life Science Quiz
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BIOLOGICAL EVOLUTION: UNITY AND DIVERSITY
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A population of bacteria has variation in antibiotic resistance: some are resistant (R) and some are not resistant (N). An antibiotic is added to the environment. The table shows the number of bacteria after 24 hours. Start: R = 10, N = 990 After antibiotic: R = 800, N = 5 Which explanation best describes natural selection in this population using the evidence? (Natural selection affects populations, not individuals.) Figure accompanying this question
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