because birth rates and death rates relate to population. the Birth Rate shows how much a population is increasing, and death rates show how much a population is decreasing. when you average the two out, it will give you the population(:
the answer is by comparing birthrates and death rates
Birth rates and death rates
Demographers figure out population growth by comparing birth rates and death rates.
Demographic Transition
demographic transition
Demographers study human population size, density and distribution, movemenet, and its birth and death rates
Population decreases
For the past century the birthrates in human culture have far out numbered the death rates which is why our world population has been steadily growing. People are living longer than they did in our past.
The ice in the box
Probably, but birthrates, too.
Birthrates , death rates, women and male intercourse
When death rates lowered but birthrates stayed high, the population skyrocketed.