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In which situation can age structure change even when births, deaths and migration keep total population balanced?

Answer and explanation

Correct answer: When shares of children, youth and elderly change

The direct answer is A. Population size and population structure are different ideas. Total population can remain balanced when additions and losses offset one another, but the proportions of age groups can still change. Step 1: births add children, while deaths may occur more often among older people. Step 2: migration may bring mostly working-age adults or may remove young adults from an area. Step 3: these changes alter the shares of children, youth and elderly people even if the total number stays constant. Option A correctly identifies the change in age structure. B says all groups remain unchanged, so there is no structural change. C is not enough to explain a changing age structure and would stop new children being added. D describes an empty population, not a meaningful age-structure comparison. Memory cue: size asks “how many,” while structure asks “which kinds or age groups.” A balanced total does not guarantee a balanced age composition.

Related tags

Age StructurePopulation BalanceDemographic ChangeProcesses Of Population ChangePopulationGeographyClass 9 Mcq

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