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(B) $DDT$ (Dichlorodiphenyltrichloroethane) is a persistent organic pollutant that undergoes biomagnification. In birds,high concentrations of $DDT$ i

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Many of the birds' eggs laid did not hatch

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(B) $DDT$ (Dichlorodiphenyltrichloroethane) is a persistent organic pollutant that undergoes biomagnification. In birds,high concentrations of $DDT$ interfere with calcium metabolism. This leads to the thinning of the eggshells. Consequently,these thin-shelled eggs break prematurely during incubation,resulting in a significant decline in the bird population because many of the eggs laid did not hatch.

In an area where $DDT$ had been used extensively,the population of birds declined significantly because

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