Final answer:
Fertility rates, mortality rates, and net migration are key factors influencing natural population growth.
Explanation:
Fertility rates (crude birth rate), mortality rates (crude death rate), and net migration are the main factors contributing to a country's natural population growth. Fertility rates represent the number of live births per 1,000 women, mortality rates indicate the number of deaths per 1,000 people, and net migration accounts for the difference between immigration and emigration.
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