Population Size

Population size is affected by a number of factors. The size of the population obviously can increase when the birth rate rises, unless the death rate also increases accordingly. Likewise, the size of the population can decrease when the death rate rises, unless the birth rate also increases commensurate with the death rate. A rise in fertility can precipitate an accompanying rise in the birth rate, and a decrease in fertility can lower the birth rate; therefore, conditions that mitigate against fertility, such as advanced age, are a factor i

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