A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population
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Mortality is the relative frequency of deaths in a specific population.
Natality is the ratio of the number of births to the size of the population.
Immigration is the action of coming into an area from another area or country.
Emigration is the action of leaving an area and settle in another area or country.
Natality + Immigration = 270
Mortality + Emigration = 270
Net increase in population is 
.
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