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Why is it necessary to study births, deaths and migration together in population change?

Answer and explanation

Correct answer: Because all three together can increase or decrease total population

Correct answer: A. Population change is best understood by considering births, deaths, and migration together. Births add people, deaths remove people, in-migration adds people from outside, and out-migration removes residents who leave. A useful relationship is: population change = births − deaths + in-migration − out-migration. Thus, one process may increase the population while another reduces it. Option A is correct because the combined effect determines whether the total population rises or falls. B is wrong because births alone ignore deaths and movement. C is wrong because deaths directly reduce the number of people. D is wrong because migration changes the distribution and number of people, not the weather. For example, high births may be offset by high out-migration. Memory cue: add births and arrivals; subtract deaths and departures.

Related tags

Population ChangeBirthsDeathsMigrationPopulation FormulaProcesses Of Population ChangePopulationGeography

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