Fill in the Blanks POPULATIONOnline version Why does population change? by Gonzalo Barral 1 increase work children higher dividing move emigrants wars decreases die grows rate inmigrants born Migration families country area disasters average population fertility 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 .