Area of sociology devoted to the study of human populations.

population

Demography

birthrate

fertility

fecundity

mortality

The correct answer is: "demography"

Demography is a discipline that studies the evolution of populations, specially of human beings, by using statistical methods. It analyzes population dynamics, hence, how every specific population changes over time or space. It studies the size, distribution and structure of the population and derived changes over time by calculating specific rates to assess how birth, migration, aging, and death evolve.