Final answer:
Demography is the statistical study of population changes over time, including birth rates, death rates, and life expectancies.
Step-by-step explanation:
Demography is the statistical study of population changes over time, including birth rates, death rates, and life expectancies. It enables scientists to study the dynamics of a population and understand how these factors are influenced by population characteristics such as size, density, and composition. It helps scientists understand how these factors are influenced by population characteristics such as size, density, and composition. For example, a large population size can result in higher birth rates due to the presence of more potentially reproductive individuals. On the other hand, a large population size can also lead to higher death rates due to competition and disease. Demography is considered a cross-disciplinary field, intersecting with sociology, economics, anthropology, and history. It is commonly used to study human populations, but can also be applied to populations of other species.