The population of India at the time of Christ was approximately

Phenomenal and rapid increase of population in a short period is called

Which one of the following causes population explosion?

As a country becomes industrialized,its population growth:

The total population of the world by the end of the $20^{th}$ century reached approximately:

$A$: Population of India crossed one billion in May $2000$.
$R$: It is the result of a rapid decline in death rate,maternal mortality rate $(MMR)$,and infant mortality rate $(IMR)$,as well as an increase in the number of people in the reproductive age.