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Population is a term that is used in the set of humans or other organisms in a given region or area Governments conduct a census to quantify the resident population size within a given jurisdiction However, population pyramids can be categorised into three types These types have been identified by the fertility and mortality rates of a country [6] stationary pyramid or constant population pyramid a pyramid can. Larger types at this level would be: Demography is the statistical and mathematical study of the size, composition, and spatial distribution of human populations and how these features change over time Data are obtained from a census of the population and from registries Records of events like birth, deaths, migrations, marriages, divorces, diseases, and employment. This is a collection of lists of organisms by their population While most of the numbers are estimates, they have been made by the experts in their fields Species population is a science falling under the purview of population ecology and biogeography Individuals are counted by census, as carried out for the piping plover [3][4] using the transect method, as done for the mountain plover. Earth has a human population of over 8.2 billion as of 2025, with an overall population density of 50 people per km 2 (130 per sq Nearly 60% of the world's population lives in asia, with more than 2.8 billion in the countries of india and china combined. Population geography is the study of the distribution, composition, migration, and growth of human populations in relation to the geographic characteristics of specific area. Population density (people per square kilometre) map of the world in 2020 population density is the number of people per unit of area, usually transcribed as per square kilometre or square mile, and which may include or exclude, for example, areas of water or glaciers.