Eye color for a plausible argument stating that some eyes can or do change, based on chemical reactions and hormonal changes within the body. Studies on Caucasian twins, both fraternal and identical, have shown that eye color over time can be subject to change, and major demelanization of the iris may also be genetically determined. Most eye-color changes have been observed or reported in the Caucasian population with hazel and amber eyes. Carleton Coon created a chart by the original Martin scale. The numbering is reversed on the scale below in the (later) Martin–Schultz scale, which is (still) used in physical anthropology.
Critical medical anthropology the idea of “nature”—the way external reality is conceived and related to by humans—but also the very physical shape of nature, including human biology, that has been deeply influenced by an evolutionary history of social inequality, overt and covert social conflict, and the operation of both physical power and the power to shape dominant ideas and conceptions in society and internationally through processes of globalization, control of production and reproduction, and control of labor. Critical medical anthropology Critical medical anthropology (CMA) is a branch of medical anthropology that blends critical theory and ground-level ethnographic approaches in the consideration of the