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

1. birds stopped laying eggs
2. earthworms in the area got eradicated
3. cobras were feeding exclusively on birds
4. many of the birds laid, did not hatch

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

Solution

DDT causes biomagnification, leading to thinning of eggshells in birds. As a result, many eggs laid by birds fail to hatch, causing a population decline.

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