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(D) $DDT$ undergoes biomagnification in the food chain. In birds,high concentrations of $DDT$ interfere with calcium metabolism. This leads to the thi

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many of the birds eggs laid,did not hatch.

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(D) $DDT$ undergoes biomagnification in the food chain. In birds,high concentrations of $DDT$ interfere with calcium metabolism. This leads to the thinning of eggshells. Consequently,these thin-shelled eggs break prematurely during incubation,preventing the embryos from developing fully and hatching. Thus,the population of birds declines significantly.

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

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