demography

noun

1. (uncountable, usually)The study of the characteristics of human populations, especially with regards to their makeup and fluctuations and the social causes behind these.
2. (uncountable, usually)The study of the structure and population dynamics of other lifeforms, such as mammals, insects, plants, etc.
3. (uncountable, usually)The particular demographic makeup of a population.

   “the schoolʼs demography began to change with the immigrants and their offspring pouring in”

   “Above all, it is in the process of transforming itself so fundamentally through demography that, in a few decades at most, it will no longer make sense to call this the same society.”