The permanent decrease in population number occurs due to
Emigration
Migration
Natality
Mortality
A
Migration
B
Natality
C
Emigration
D
Mortality
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Solution
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There are multiple factors, which affect the size and density of the population. It includes natality, mortality, emigration and immigration.
The mortality rate is the number of deaths per thousand individuals per year. It decreases the population size and its density. It is the rate at which people die. It leads to decrease in the population.
So, the correct answer is option D.
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