The answer to this question is simply a matter of understanding a little about genetics. There is a tremendous potential for variation within the children of just one human couple. Evolutionist Francisco Ayala calculates that a single human couple could produce 102,017 children before they would have to produce an identical twin. The number of atoms in the known universe is a mere 1080, nothing at all compared with the variety that is present in just two human beings. In fact, it would take only one generation to get all the variations of skin color that we see among people today. If two parents with medium skin color (possessing recessive genes of both black and white), had sixteen children, on the average one child would be completely black with no capability of passing on any “white” genes. One child would be completely white with no capability of passing on any “black” genes. Four children would be medium black, four medium white, and six children (less than half) would be the same color as their parents. God placed in Adam and Eve and ultimately in Noah’s sons and their wives, all the genetic capabilities to produce the variation in human beings that we see in our world today (CREATION: THE FACTS OF LIFE, by Gary Parker, page 77-79) After the Flood and the incident at the tower of Babel, people scattered over the face of the earth according to their languages. Continual marrying and producing children within their group eventually produced dominant characteristics that became the various races of people in the world (See Genesis 10).