Life is a series of changing beliefs and the lucky ones are those whose beliefs harmonize closely with nature's eternal law. Race means a tribe, breed or group of individuals descended from a common ancestor. Life is not continually created. An individual is a composite of what his parents are. Thus, a race will always have attributes shared in common and all members will appear very similar.
Miscegenation appears to have been a popular activity of all men throughout all ages.
Whether found in a substance such as bauxite or clay, this in no way validates the notion that there is no such thing as aluminum. Natural selection and environmental pressures have always skewed man's gene pool unlike that of the gazelle whose environment has remained static over the aeons. Man wanders and encounters new problems. He often changes his diet to fit what is available. The lion's diet remains relatively stable as does his territory.