1. Birth rate: The number of births per 1,000 individuals in a population per year. Higher birth rates contribute to population growth.
2. Death rate: The number of deaths per 1,000 individuals in a population per year. Lower death rates contribute to population growth.
3. Immigration: The number of individuals moving into a population from another area. Immigration increases the population size.
4. Emigration: The number of individuals moving out of a population to another area. Emigration decreases the population size.
5. Fertility rate: The average number of children born to a woman during her reproductive years. Higher fertility rates contribute to population growth.
6. Life expectancy: The average number of years a person is expected to live. Higher life expectancy contributes to population growth.