(B) Increased concentration of $DDT$ in the body of birds interferes with calcium metabolism. This disruption leads to the thinning of eggshells. As a

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(B) Increased concentration of $DDT$ in the body of birds interferes with calcium metabolism. This disruption leads to the thinning of eggshells. As a result,the eggshells break prematurely before the embryo reaches maturity,leading to a decline in bird populations.