Anthropology is the study of modern humans, their ancestors, and closest relatives (non-human primates). Biological anthropologists study the evolution of humans and other primates and modern human populations. Archaeologists trace the evolution of culture over the past three million years, analyzing ancient environments and modern material culture. Linguistic anthropologists are interested in the relationships between language, culture, society, and the individual. Cultural anthropologists look at relations between culture and the environment, family and society, gender, urbanization, and politics and history. After completing introductory course work, students may continue to study all four areas or focus on a sub-discipline.