The difference between the birth rate and death rate in the overall population. If the number of children born each year is equal to the number of adults that are dead. The population is stable, there are many people talking about. Shows that while there are several factors that can increase the death rate in a short period of time the person has made a rate increase for a long period of time. The discovery of agriculture by our ancestors is one factor, they have the ability to maintain their nutritional value without leaving the hunt. This creates an imbalance between the rate of two times.
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