Study of the biological origins, mechanisms, development, and variation of humankind.
Study of the structure and function of the human body (and mind), encompassing the subjects of morphology, anthropometry, human variation, biolinguistics, auxology, behavioral neuroscience, etc.
Study of the evolutionary origins and development of the human species, encompassing the subjects of paleoanthropology, behavioral ecology, etc.
Study of conditions and lifestyle modifications that affect the human body (and mind), encompassing the subjects of pathology, immunology, psychiatry, etc.