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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.

1 Answer

5 votes

Answer:

A

Step-by-step explanation:

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