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

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

1.Cobras were feeding exclusively on birds

2.Many of the birds eggs laid, did not hatch

3.Birds stopped laying eggs

4.Earthworms in the area got eradicated

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