Several organisms from a strain of bacteria infecting hospital patients inherited a mutation that increased their resistance to the hospital's antibacterial drugs.Over time,the drug-resistant bacteria increasingly outnumbered the bacteria without the mutation.This best illustrates

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The situation described is an example of natural selection, where a beneficial mutation (increased resistance to antibacterial drugs) provides a fitness advantage, allowing the resistant bacteria to survive and reproduce more successfully than their non-resistant counterparts. Over time, this can lead to an increase in the proportion of the resistant bacteria in the population.

Several Organisms from a Strain of Bacteria Infecting Hospital Patients