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Q 1954812754.     A decade ago, mosquitoes responded to DDT
and there was no threat to the lives of people.
But now mosquitoes do not respond to DDT
any longer. Their number of cases of malaria and
dengue is on the rise every year.

(a) How can you explain this change?
(b) Which theory supports this?

NCERT Value Based 7/4/SAT

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