AP Biology

Answer: D, The factor that does not influence human fertility rates is geography. Additional factors that influence human fertility include sexual behavior and instinct.

Key Takeaway: Human population growth is simply the difference in birth rates and mortality rates. When birth rates exceed mortality rates, the population grows, and when the converse occurs the population shrinks. The birth rate is closely linked to the fertility rate. Interestingly, many of the same factors that influence the fertility and consequently birth rate also affect the mortality rate. A decrease in per capita income tends to increase the mortality rate and decrease the birth rate.