FORESTRY
ECOLOGY AND ENVIRONMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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immigration
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emigration
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increased birth rates
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increased death rates
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Detailed explanation-1: -When demographers attempt to forecast changes in the size of a population, they typically focus on four main factors: fertility rates, mortality rates (life expectancy), the initial age profile of the population (whether it is relatively old or relatively young to begin with) and migration.
Detailed explanation-2: -The younger a population, the faster that population grows because the birth rate is higher and the death rate is lower (Fig. 13-1). When birth rate is expressed per age group, it is called the standardized birth rate, as opposed to the crude birth rate of the total population.
Detailed explanation-3: -The mother’s preference of family size, which influences that of the children through early adulthood. Social pressure from kin and friends to have another child. Social support. Happiness, with happier people tending to want more children. A secure housing situation. More items