The most important reason for the massive increase in the human population over the past 200 years is
a. the Green Revolution that increased agricultural productivity.
b. the increase in the birth rate.
c. technology that has made it possible for humans to live in more places.
d. the decline in the death rate.
Question 2
Population growth was slow for most of human history because
a. death rates were very high.
b. abortion rates were very high.
c. people preferred small families.
d. low levels of technology always lead to low rates of growth.
Fetal development of human
The Human Eye
Population age 65 and over and age 85 and over, selected years 1900-2008 and projected 2010-2050.
Human genome sequence explosion
Bones of the Human Skull
Physical distance versus recombination distance on human male and female chromosome 19