What are the population pyramids How do they help in understanding about the population of country?

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What are population pyramids? How do they help in understanding about the population of a country?

The population pyramid or the age−sex pyramid is a graphical illustration that is used for studying the population composition of a country. It shows the present number of males and females in a country along with their age groups. The age-group distribution of population tells us the number of dependents and the number of economically active individuals present in the population.

Concept: Population Composition

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What are population pyramids? How do they help in understanding the population of a country?