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 a. eating the insecticide caused the bugs to become resistant to it b. eating the insecticide caused the bugs to become less resistant to it c. it destroyed organisms that cause disease in the insects, thus allowing them to live longer d. the pests developed physiological adaptations to the insecticide

(a). eating the insecticide caused the bugs to become resistant to it

Explanation:

Insecticide resistance can be defined as decreased sensitivity of a pest population toward a insecticide, which was previously effective to control those pests.

When insects or bugs eat insecticide, they become resistant to it. It is generally results due to change or mutation in bugs due to exposure of pesticide.

The population that can survive pesticide exposure transfers this resistant property to its offspring and the resulting population may said to become resistant for that particular insecticide.

Thus, the correct answer is option (a).

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