Answer :
Final answer:
Insects developed resistance to DDT, leading to the need for substitutes and illustrating the concepts of bioaccumulation and biomagnification.
Explanation:
Some insects were naturally resistant to DDT, and thus they survived to produce offspring that were resistant. This phenomenon of insect resistance to DDT led to the development of substitutes like dieldrin and methoxychlor, which also faced resistance over time. The ecological impacts of DDT, including bioaccumulation and biomagnification, led to the banning of DDT in many parts of the world.
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