Welcome to the Department of Organismic and Evolutionary Biology (OEB)! Our core mission in OEB is to study biological diversity. As our name suggests, we recognize the organism as one of the most important levels of biological organization. But in OEB we take a multi-level, integrative approach to research and teaching, which spans the range of molecules, cells, organisms, populations, species, higher taxa, communities, and ecosystems. Our curriculum explores the many ways in which Life has solved complex problems posed by past and present environments. And, we offer a wide variety of courses at both the undergraduate and graduate levels.