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Within a decade of the introduction of a new insecticide, nearly all of the descendants of the target pests were immune to the usual-sized dose. The most likely explanation for this immunity to the insecticide is that

User Evan Zamir
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Answer:d

Step-by-step explanation:

User Jay Igor
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... This was genetically passed on through generations. This was passed through genes. The ancestors were immune, therefore, they are also immune.
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