Answer:
ethological theory
The ethological theory emphasizes the strong influenced of
biology to the human behavior. It is believe that behavior is link with
evolution and to certain human experiences, which has a permanent influence on
individuals on biological factors such as critical and sensitive periods of
human development. In addition, this theory stresses the importance of biology
to human evolution and development.
Because the musculoskeletal system gives humans the ability to move so you might need to know the positions to see how they used the musculoskeletal system