population structure
sex ratio
defined as the number of males per 100 females in the world population
women tend to live 7 years longer than men do
demographic transition
why natural increase rises and falls - 4 stages
historically no country has ever reverted to a previous stage
beginning middle and end
stage 1 - low growth
stage 2 - high growth
stage 3 - moderate growth
stage 4 - low growth
declining burth rates
2 strategies for lowering birth rates
1. improve education and health care
2. contraception
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