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Population age pyramid of Nigeria in 2020, similar to all of sub-Saharan Africa. Each country will have a different population pyramid. However, population pyramids can be categorised into three types: stationary, expansive, or constrictive. These types have been identified by the fertility and mortality rates of a country. [6]
The following list of countries by age structure sorts the countries of the world according to the age distribution of their population. The population is divided into three groups: Ages 0 to 14 years: children. Ages 15 to 64 years: working population or adults. Over the age of 65: elderly, senior citizens.
The population of a village varies; the average population can range in the hundreds. Anthropologists regard the number of about 150 members for tribes as the maximum for a functioning human group. Hamlet or Band – a hamlet has a tiny population (fewer than 100), with only a few buildings.
Population Pyramids, one way to visualize a population's age class structure. Age class structures can be used to model population structures of many species including vertebrates, invertebrates, and vegetation. These models allow for the prediction of growth or decline in a population based on current conditions or future management practices.
Demographic statistics are measures of the characteristics of, or changes to, a population. Records of births, deaths, marriages, immigration and emigration and a regular census of population provide information that is key to making sound decisions about national policy. [1] [2] A useful summary of such data is the population pyramid. It ...
The Demography of the World Population from 1950 to 2100. Data source: United Nations — World Population Prospects 2017. Demography (from Ancient Greek δῆμος (dêmos) 'people, society' and -γραφία (-graphía) 'writing, drawing, description') [1] is the statistical study of human populations: their size, composition (e.g., ethnic group, age), and how they change through the ...
Population geographyis the study of the distribution, composition, migration, and growth of human populations in relation to the geographic characteristics of specific area. It focuses on how populations are distributed across space, the factors influencing these distributions, and the implications for resources, environment, and societal ...
Population structure may refer to many aspectsof population ecology: Population structure (genetics) , also called population stratification Population pyramid