Robert Yerkes, who lived from May 26, 1876 to
February
3, 1956 <span> was an </span>American psychologist, pioneer
in the area of industrial psychology. He is also an ethologist, eugenicist and
primatologist. He is best
known in the field of comparative psychology and for his work in intelligence
testing.
I believe the answer is: Developing nations
People in developing nations tend to have higher likelihood of being involved in sexual relationship without proper protection.
Many of individuals in developing nations also have very little awareness on the correlation between having more children with larger economic difficulties.
Both of these factors contributed to the increase of population.
