We can actually deduce here that projected population is based on assumptions of B. Future fertility, mortality, and migration.
What is projected population?
Population projections are actually known to be an illustration that shows one the pattern or outcome of future population size and structure. This is usually based on the levels of future fertility, mortality and migration.
The fertility which is important to tell about the birth rate is important to projected populations. Then mortality rate which shows the rate at which people die is a factor considered as well. Then, the rate at which people migrate is also put into consideration.
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