Compléter POPULATIONVersion en ligne Why does population change? par Gonzalo Barral 1 country increase rate move wars families decreases children area Migration grows disasters fertility population average work emigrants inmigrants dividing die higher born Many factors can affect : people are or and people around to find or escape natural and . The is the number of children per family . The fertility rate in Europe is about 1 . 6 . This number is calculated by the total number of by the total number of . Natural changes in population can happen when there are more births in a country than deaths . This results in an in population . If there are more deaths than births , population . is the movement of people from one to another . People that live and work in one , but are from another country , are called . People that leave their country to live in a different one are called . When there are more inmigrants than emigrants , population . If the number of emigrants is than the number of inmigrants population decreases .
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