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In which situation can population keep growing for a long time despite a low birth rate?

Answer and explanation

Correct answer: When a large young population already exists

Direct answer: A is correct. A population with many young people contains a large number of people who may enter child-bearing ages in the future. Even if the average birth rate begins to fall, the large number of potential parents can produce enough births for total population to continue increasing for some time. This delayed continuation is called population momentum. A is correct because it links future growth to the existing age structure. B is wrong because a death rate much higher than the birth rate would generally reduce natural increase. C is wrong because outward migration removes people and usually lowers population growth. D is wrong because a zero population cannot itself continue growing without people entering it. Memory cue: a young age structure can keep growth moving after fertility declines.

Related tags

Population MomentumYoung PopulationAge StructurePopulation GrowthPopulationGeographyClass 9 Mcq

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