Final answer:
Demographics is the study of how human populations change over time and space. Geographers study how populations grow, migrate, and are distributed around the world.
Step-by-step explanation:
Demographics is the subject that is being referred to in the question.
Demography is the study of how human populations change over time and space. It is a branch of human geography related to population geography. Geographers study how populations grow and migrate, how people are distributed around the world, and how these distributions change over time.
For example, geographers can use demographic data to analyze the population growth and distribution in different regions or to study the impact of migration on the composition of a population. Demographic trends and patterns can also provide insights into health issues and healthcare needs.