Demographic transition theory can be used to describe and predict the future population of any area. The theory tells us that population of any region changes from high births and high deaths to low births and low deaths as society progresses from rural agrarian and illiterate to urban industrial and literate society. These changes occur in stages which are collectively known as the demographic cycle.

The population of a region changes due to which of the following factor(s) ?

All of the above

Birth rate, death rate and migration are components of population change. The first two being natural factors and the last one is an actual factor.