Question

what is meant by population change?

Answer 1

Heya...f○lk..

The gradual change in population attributed through migration, change in birth and death rate which can eventually affect the population of a country at a specific time or in particular place is regarded as a population change.

^_^

Answer 2

population change refers to the difference between the size of the population at the end and at the beginning of a period.
in other words it is the change in the population at a specific time in a particular place.

also,
it is equal to the algebraic sum of natural increase and net migration
{including corrections}