送交者: xj 于 2005-2-18, 00:25:26:
回答: our black ancester ~15K years ago 由 JZ 于 2005-2-18, 00:12:33:
physical appearance are so different among Asian, European, and Black African.
simply stating that it is natural selection is useless, though conceptually revolutionary.
As intelligent people, we want to know what kind of process happened in history which made us so different. For example, we want to know which group replace which group, and why,when and where that happened. This is not taught in most biology class. I guess most of them are hypotheses.
To convince those racists, you have to provide hard evidence.