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Definition Of Populations
Population is defined as any group of organisms of the same species which can interbreed among themselves, and occupy a particular space and function as part of a biotic community. A population has various properties like population density, natality (birth rate), mortality (death rate), age distribution, biotic
potential, dispersion and ‘r’, ‘K’ selected growth forms.
A population possesses genetic characteristics that are directly related to their adaptiveness, reproductive success, and persistence in their habitats over time. Life history of an organism is an important part of this attribute. The population has a definite structure and function that can be described with reference to time.
A population is a distinct group of individuals, whether that group comprises a nation or a group of people with a common characteristic. Thus, any selection of individuals grouped together by a common feature can be said to be a population.
The top 10 most populous countries are: China, India, United States, Indonesia, Brazil, Pakistan, Nigeria, Bangladesh, Russia, and Mexico.
Three kinds of populations used in the history and philosophy of population genetics, population biology, and evolutionary ecology can be distinguished: theoretical, laboratory, and natural.
There are three types of population pyramids: expansive, constrictive, and stationary. Expansive population pyramids depict populations that have a larger percentage of people in younger age groups. Populations with this shape usually have high fertility rates with lower life expectancies.