it is just because of the people that die die and they cant come back in a miracle just think about it.
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The birth rate affects the size of population because of what its like. And the death rate is more than you can imagine.
The population size also depends on migration, for which there is no information provided.
qualitative
births, death, immigration and emigration
I understand by birth and death rate is that it is a statistic kept by National Government, county and local councils to enable forward planning. It should be an indicator of where resources are best used to the advantage of society, as a whole.