Population pyramids are useful to

Explanation

The correct answer is to Express the age-sex distribution of a population. Key Points Population pyramids are important graphs for visualizing how populations are composed when looking at groups divided by age and sex. The population pyramid is a graphical representation of the age and sex composition of a specific population . Age structure represents the number of people of different age groups and is an important indicator of population composition . Demographers express the share of the dependent age groups using a metric called the 'age dependency ratio'. This measures the ratio between 'dependents' (the sum of young and old) to the working-age population that is aged between 15 to 64 years old . The large size of the population in the age group of 15- 59 indicates a large working population . A greater proportion of the population above 60 years represents an ‘ageing population’ or ‘the elderly population’ which requires more expenditure on health care facilities. A high proportion of the young population would mean that the region has a high birth rate and the population is youthful .This population is known as children and young adolescents who are under 15 years old .