Mention the four basic sources that fluctuate the density of population in a given habitat

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​Four processes that leads to a fluctuation in the density of population of a given habitat:
  • Natality: It refers to the number of births during a given period in the given population.
  • Mortality: It refers to number of deaths during a given period in the given population.
  • Immigration: Immigration means movement of people to a new country of which they are not the residents and does not possess its citizenship for permanently settling down.
  • Emigration: Emigration means leaving one's country or region and getting settle to another.
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