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[" 40In an area where DDT had been used ...

[" 40In an area where DDT had been used extensively,the "],[" population of birds declined significantly because "],[" (a) birds stopped laying eggs "quad " CBSE-AIPMT 2012"],[" (b) earthworms in the area got eradicated "],[" (c) cobras were feeding exclusively on birds "],[" (d) many of the birds laid eggs that did not hatch "]

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