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

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

Options

(a) birds stopped laying eggs
(b) earthworms in the area got eradicated
(c) cobras were feeding exclusively on birds
(d) many of the birds laid, did not hatch

Correct Answer:

many of the birds laid, did not hatch

Explanation:

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