Final answer:
If a country has a total fertility rate equal to replacement level fertility and emigration equal to immigration, the population must be stable.
Step-by-step explanation:
If a country has a total fertility rate equal to replacement level fertility and emigration equal to immigration, then the population must be stable. Replacement level fertility refers to the rate at which each generation replaces itself without increasing or decreasing the population. Emigration equal to immigration means that the number of people leaving the country is equal to the number of people entering the country, resulting in no net change in population size. Therefore, the population would remain stable.