The graph shows how the world population has increased between the years of 1950 and 2000. based on the data, which is a valid conclusion?
a) human population will probably stop growing by 2010.
b) the 6 billionth person on earth was born around 1985.
c) more people were born between 1950 and 1960, than between 1990 and 2000.
d) from 1950, the human population doubled in a period only about 40 years.