Which one of the following is not a fact?
Human population increased more than ten times during the past 500 years.
Nearly 80 million people are added to the world population each year.
It took 100 years for the population to rise from 5 billion to 6 billion.
Population growth is high in the first stage of demographic transition.
C.
It took 100 years for the population to rise from 5 billion to 6 billion.