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Concepts of the emigration-migration and immigration

How different are the concepts of the emigration, migration and immigration?

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Migration is moving of individuals of species from one place to any other place. Emigration is migration seen as an exit of individuals from one area (to another where they will settle enduringly or provisionally). Immigration is the migration seen as the settling in one area (permanently or temporarily) of individuals coming from any other region. Thus individuals emigrate "from" and immigrate "to".

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