A Vocabulary List for AP Human Geography Unit II. Population?Basic Vocabulary and Concepts Population Age distribution Carrying capacity Cohort Demographic equation Demographic momentum Demographic regions Demographic Transition model Dependency ratio Diffusion of fertility control Disease diffusion Doubling time Ecumene Epidemiological Transition model Gendered space Infant mortality rate J-curve Maladaptation Malthus, Thomas Mortality Natality Neo-Malthusian Overpopulation Population densities Population distributions Population explosion Population projection Population pyramid Rate of natural increase S-curve Sex ratio Standard of living Sustainability Underpopulation Zero population growth Migration Activity space Chain migration