The population of a place increases or decreases due to natural and migratory growth.
- Natural growth. This is the difference between the number of babies who are born in a place in one year and the number of people who die.
- Migratory growth. This is the difference between the number of inmigrants who come to live in a place and the emigrants who leave the place.
Emigrants leave their place of birth and go to live somewhere else.
Inmigrants come to live in a new place.
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