Mortality is a data piece for a demographer that would be interested in studying demography. It is fundamental to estimate population size.
Mortality refers to the rate of deads in a given population for a particular period of time (often one year calendar).
Conversely, the birth rate refers to the rate of births in a given population for a particular period of time.
Demography is a discipline that studies human population dynamics, which includes both mortality and birth rates.
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