Answer:
(a) Migration is a determinant factor of population change. Migration is the movement of people across regions. It can be internal and international. (b) International migration changes the size of the population. Internal migration does not change the size of the population but influences the distribution of population within the nation. Migration also changes the composition of urban and rural population in terms of age and sex composition. In India, the rural-urban migration has resulted in a steady increase in the percentage of population in cities and towns.
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