What are the three main factors responsible for population growth or change?

Factors responsible for population growth:

• Fertility rate

The factor that affects the growth of the population in a major way is the fertility rate. The fertility rate is typically calculated by the number of children per one woman of child-bearing age.

• Mortality rate

An important factor affecting the growth of the population is the death, or mortality, rate. The birth of new people increases the population size; deaths decrease it.

• Migration

Migration is the act of people moving from one state to another. It affects the population size of both the host and destination countries.