Diamond explores the question of how "Homo sapiens" came to dominate its closest relatives, such as chimpanzees, and why one group of humans (Eurasians) came to dominate others (indigenous peoples of the Americas, for example). In answering these questions, Diamond (a professor in the fields of physiology and geography) applies a variety of biological and anthropological arguments to reject traditional hegemonic views that the dominant peoples came from "superior" genetic stock and argues instead that those peoples who came to dominate others did so because of advantages found in their local environment which allowed them to develop larger populations, wider immunities to disease, and superior technologies for agriculture and warfare.