Discussion
Which of the following factors does not alter the total size of the population of a country ?
Answer: B
The factor that does not change a country's total population is internal migration.
A country's population changes through only three components: births, deaths and migration across its borders. Internal migration, people moving from one region of the country to another, for example from villages to cities, redistributes the population but leaves the national total unchanged.
External migration and refugee movements across the border add people to or take them from the country, and higher fertility than mortality means more births than deaths, a natural increase. All three alter the total size of the population.
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