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.
Geometric morphometrics in anthropology be used to help explore the answers to a lot of questions in physical anthropology. Geometric morphometrics is part of a larger subfield in anthropology, which has more recently been named virtual anthropology. Virtual anthropology looks at virtual morphology, the use of virtual copies of specimens to perform various quantitative analyses on shape (such as geometric morphometrics) and form... The field of geometric morphometrics grew out of the accumulation of improvements of methods and approaches over several decades beginning with Francis Galton (1822-1911). Galton was a polymath and the president of the Anthropological Institute of Great Britain. In 1907 he