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It is the study of culture, and is often based on ethnography.Ethnography can refer to both a methodology and a product of research, namely a monograph or book.Biological anthropology or Physical anthropology, focuses on the study of human populations using an evolutionary framework.Biological anthropologists have theorized about how the globe has become populated with humans (e.g.

Archaeologists also investigate nutrition, symbolization, art, systems of writing, and other physical remnants of human cultural activity.

In the 1990s and 2000s, calls for clarification of what constitutes a culture, of how an observer knows where his or her own culture ends and another begins, and other crucial topics in writing anthropology were heard.

It is possible to view all human cultures as part of one large, evolving global culture.

This has even led to departments diverging, for example in the 1998-9 academic year at Stanford University, where the "scientists" and "non-scientists" divided into two departments: Anthropology, and Cultural and Social Anthropology.

Anthropology is traditionally divided into four sub-fields, each with its own further branches: biological or physical anthropology, social anthropology or cultural anthropology, archaeology and anthropological linguistics.