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Certain weeds have come resistant to the pesticides that were used to kill them. Which of the following choice?

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Certain weeds have come resistant to the pesticides that were used to kill them. Which of the following choice?

Which of the following choices is the best explanation for this phenomenon?
A the pesticides evolved so that they are no longer useful against the weeds
B natural selection acted on the genetic variability present in the weeds genomes
C continental drift caused the evolution of weed resistance in the pesticide
D the weeds have become different species

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