New forms of drug-resistant bacteria can evolve quickly because
A. when a drug kills most of the bacteria, the ones left to breed are those that have a natural resistance to the drug.
B. when scientists genetically engineer bacteria they use natural selection.
C. scientists use extinction to selectively breed bacteria.
d. a drug causes mutations in the bacteria, leaving only mutated bacteria left to breed.
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New forms of drug-resistant bacteria can evolve quickly because
A. when a drug kills most of the b...
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