Population Change

Populations can change through three processes: fertility, mortality, and migration. Fertility involves the number of children that women have and differs from fecundity (a woman's childbearing potential). Mortality [blank] the study of the causes, consequences, and measurements of processes affecting death in a population. Demographers most commonly study mortality using the Life Table, a statistical [blank] which provides information about the mortality conditions (most notably the life expectancy) in the population. Migration refers to the movement of persons from an origin place to a destination place across some pre-defined political boundary. Migration researchers do not designate movements as migrations' [blank] they are somewhat permanent. Thus demographers do not consider tourists and travellers to be migrating. While demographers who study migration typically do so through census data on place of [blank] , indirect sources of data include tax forms and labor force surveys.