Examlex
What is the source of estrogen and progesterone during the first 10 weeks of pregnancy?
Subsistence
The minimum level of resources (food, shelter, clothing) that is required for individuals to survive.
Thomas Malthus
An English scholar and demographer known for his theory that population growth will always tend to outrun the food supply and that betterment of humankind is impossible without strict limits on reproduction.
Total Fertility Rate
An estimate of the average number of children a woman will have over her lifetime, based on current birth rates.
Replacement Rate
In demography, it refers to the fertility rate at which a population exactly replaces itself from one generation to the next, without migration. In economics, it can refer to the ratio of benefits (like pensions) replacing employment income.
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