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Why must migration be considered along with births and deaths when studying population growth of a country?

Answer and explanation

Correct answer: Because migration can change the total population size

Births and deaths show natural change, but they do not account for people moving across a country's borders. In-migration adds residents, while out-migration removes residents. Consequently, a country can have positive natural increase but little total growth if many people leave, or rapid total growth if many people enter. Migration can therefore change the actual population size independently of births and deaths.

Option A is correct. A complete population-change calculation combines natural increase with net migration: \(Total\ change = Births - Deaths + (Immigration - Emigration)\). The other choices are false because migration does not automatically eliminate births or deaths, and it does not change only land area. Its direct demographic effect is on the number and composition of residents.

Related tags

MigrationPopulation ComponentsTotal GrowthNatural ChangePopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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