So yupuration, many mutations
4. within a decade of the introduction of a new insecticide, nearly all of the descendants of the target insects are resistant
to the usual-sized dose. what is the most likely explanation for this change in susceptibility to the insecticide?
a. eating the insecticide caused the insects to become more resistant to it.
b. eating the insecticide caused the insects to become less resistant to it.
c. the pesticide destroyed organisms that cause disease in the insects, thus allowing them to live longer.
d. the insects developed physiological adaptations to the insecticide.

The correct answer is d. The insects developed physiological adaptation to the insecticide.

Explanation:

When an organism start to live in a new environment after certain period of time the organism get adapted to that new environment.

     similarly insect becomes adapted to that insecticide after being exposed to the later for a long period of time.

     The adaptation may include various changes in the body physiology of the insect which help them to survive in presence of that insecticide.

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explanation:

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for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .