Hemographers
The people that study ruins are archaeologist.
People who study pathology are called pathologists.
People who study psychology are called psychologists.
The study of information related to people and populations is "social studies".
Demography is the statistical study of human populations The focus in demography is on a population. while The term demographics refers to characteristics of a population such as total fertility rate, or political theories
People who study bats are called chiropterologists.
It is the study of diseases (epidemics) as they affect and relate to groups of people and populations as a whole, rather than on an individual basis.
Epidemiology is the study of factors affecting the health and illness of populations. The specialist is called an epidemiologist.
populations
Demographers.
Zoologists.
pharmacologists