The best description of rapidly expanding population is rate a high birth rate and many individuals in the younger age groups.
Population growth or population growth Listening or total population change refers to the difference between the size of a population at the end and at the beginning of a given period (usually one year).
It can be expressed as the rate of change in the number of individuals within a population per unit of time and for any species (animal or plant, for example).
It is divided into two distinct parts:
* natural increase; the difference between the number of live births and the number of deaths in a territory during a period. It can be either positive or negative.
* net migration.
A population explosion is a very high population growth and therefore very fast population