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(A) The environmental stress (such as pesticides) does not cause direct changes in the genome. Instead,it acts as a selective pressure that favors the

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Random mutations

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(A) The environmental stress (such as pesticides) does not cause direct changes in the genome. Instead,it acts as a selective pressure that favors the survival of individuals possessing pre-existing random mutations that confer resistance. These resistant individuals then reproduce and pass the beneficial traits to their offspring,leading to the development of a resistant population over generations.

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

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