Answer:
Population growth is based on four fundamental factors: birth rate, death rate, immigration, and emigration.
emigration: Emigration is the act of leaving a resident country or place of residence with the intent to settle elsewhere. Conversely, immigration describes the movement of people into one country from another. Hence one might emigrate from one's native country to immigrate to another country.
immigration:Immigration is the international movement of people to a destination country of which they are not natives or where they do not possess citizenship in order to settle as permanent residents or naturalized citizens.
Step-by-step explanation: