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Population is the term typically used to refer to the number of people in a single area. Governments conduct a census to quantify the size of a resident population within a given jurisdiction. The term is also applied to non-human [ [Animal| microorganisms, and plants, and has specific uses within such fields as ecology and genetics .
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') is the statistical study of human populations: their size, composition (e.g., ethnic group, age), and how they change through the interplay ...
The book An Essay on the Principle of Population was first published anonymously in 1798, but the author was soon identified as Thomas Robert Malthus.The book warned of future difficulties, on an interpretation of the population increasing in geometric progression (so as to double every 25 years) while food production increased in an arithmetic progression, which would leave a difference ...
t. e. Ecology (from Ancient Greek οἶκος (oîkos) 'house', and -λογία ( -logía) 'study of') [A] is the natural science of the relationships among living organisms, including humans, and their physical environment. Ecology considers organisms at the individual, population, community, ecosystem, and biosphere levels.
Population. A group of conspecific individuals that is demographically, genetically, or spatially disjunct from other groups of individuals. Aggregation. A spatially clustered group of individuals. Deme. A group of individuals more genetically similar to each other than to other individuals, usually with some degree of spatial isolation as well.
Public opinion, or popular opinion, is the collective opinion on a specific topic or voting intention relevant to society. It is the people's views on matters affecting them. The term originates from France, and first appeared in the 17th century, though writers had identified the importance of the opinion of the people long before this.
Historical demography is the quantitative study of human population in the past. It is concerned with population size, with the three basic components of population change ( fertility, mortality, and migration ), and with population characteristics related to those components, such as marriage, socioeconomic status, and the configuration of ...
Genographic Project. ISOGG. v. t. e. Population genetics is a subfield of genetics that deals with genetic differences within and among populations, and is a part of evolutionary biology. Studies in this branch of biology examine such phenomena as adaptation, speciation, and population structure. [1] Population genetics was a vital ingredient ...