First of all, nobody is claiming that "black people are a link between apes and white people." That's something you just made up from whole cloth. My point is that the frequency of the alleles responsible for human skin color has changed over time. That's called evolution. There's no presumption that some people are "more evolved" than others, or that one group of people are closer to apes than others. All humans do not share the exact same pattern of allele frequencies, however. Dark skin is favored in warmer, equitorial climates. Light skin is favored in colder climates. As far as white people evolving in Egypt is concerned, where is your evidence that this is how it happened? Isn't it possible that the people who formed the earliest civilizations in Egypt were migrants from another part of the world who had evolved lighter colored skin? Isn't it possible that the main barriers to interbreeding were cultural and sociological rather than geological? (Ie. the Egyptians considered themselves superior to the surrounding non-Egyptians)