Final answer:
Demographers explore topics related to human populations, including fertility and mortality rates, demographic theories, and population trends and patterns.
Step-by-step explanation:
Demographers explore various topics related to human populations. They study demographic measurements such as fertility and mortality rates, as well as demographic theories like Malthusian, zero population growth, cornucopian, and demographic transition theories. They also analyze current population trends and patterns, and investigate the impact of factors like birthrates, mortality rates, and migration on population size and structure.