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(C) The development of pesticide resistance in insects is primarily driven by the process of natural selection acting on pre-existing genetic variatio

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Random mutation

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(C) The development of pesticide resistance in insects is primarily driven by the process of natural selection acting on pre-existing genetic variation within the population.Random mutations occur spontaneously in the insect population.When a pesticide is applied,most insects are killed,but those few individuals that happen to possess a random mutation conferring resistance survive.These survivors reproduce and pass the resistance-conferring genes to their offspring.Over successive generations,the frequency of these resistance genes increases in the population,leading to the development of a resistant strain.

The most likely reason for the development of resistance against pesticides in insects damaging a crop is

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