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If natural increase is zero why can population structure still change in an area?

Answer and explanation

Correct answer: Because migration can bring or take different age groups

Correct answer: A, because migration can bring in or remove different age groups. Natural increase is the difference between births and deaths. If births and deaths are equal, natural increase is zero, but this says nothing about migration. Suppose many young adults move into an area for work or education; the share of working-age people rises even though births equal deaths. Conversely, if young adults leave, the area may have a larger proportion of children or older people. Population structure describes the composition of a population, such as its age or sex groups, not merely its total size. B is meaningless and does not explain demographic change. C confuses physical area with age composition. D is false because migration can alter composition. Memory cue: zero natural increase controls births minus deaths, not movement across the boundary.

Related tags

Natural IncreaseMigrationAge StructurePopulation CompositionProcesses Of Population ChangePopulationGeographyClass 9 Mcq

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