Increases in population sizes occur due to immigration and births, while emigration and deaths cause decreases.
Los aumentos en los tamaños de las poblaciones ocurren debido a la inmigración y los nacimientos, mientras que la emigración y las muertes provocan disminuciones.
| Front | inc/dec pop sizes |
|---|---|
| Back | immigration/birth inc no of indivuals and emigration/death decreases this |
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