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Q.

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

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a

Earthworms in the area got eradicated 

b

Cobras were feeding exclusively on birds 

c

Birds stopped laying eggs 

d

Many of the birds eggs laid, did not hatch 

answer is D.

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Detailed Solution

DDT causes poor calcium metabolism, the thinning of egg shell, premature breaking of eggs.

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