Physical anthropology covers such diverse topics as who were our earliest ancestors and what did they look like, to how have modern humans adapted to their various global environments. Some physical anthropologists even study the skeletal remains of murder victims in order to help find out how and why the met their untimely end.
Physical anthropology is a large, and dynamic field.
With its applications in other sciences, this field is always going new directions. If it has to do with the human body or its makeup, it has to do with physical anthropology.