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

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

(1) cobras were feeding exclusively on birds

(2) birds stopped laying eggs

(3) many of the birds laid, did not hatch

(4) earthworms in the area got eradicated

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Correct answer: (3) many of the birds laid, did not hatch

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