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A country with a high rate of population growth took measures to reduce it. The Figure below shows age-sex pyramids of populations A and B twenty years apart.

1. Vanishing population
2. Stable population
3. Declining population
4. Expanding population

Correct answer: Declining population

Solution

A declining population has fewer young people entering the population than older cohorts leaving it, so the age-sex pyramid becomes narrower at the base over time. The figure indicates reduced birth rates and a contracting future population, which matches declining population.

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