12. Discuss the doctor responsible den inbalances in the Sex-age found in different parts of the world?
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Explanation:
The factors responsible for the imbalance in the sex ratio in different parts of the world are discussed below:
(i)In the developing countries infant mortality is higher among males than females.
(ii)In developed countries male mortality is higher than females.
(iii)Migration of males or females also affects sex ratio.
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