[gore3000]

And that *identical* mutation that prevents us and chimps from making vitamin C?

It is interesting that you should post the above as proof of evolution. How can something that makes an individual less fit be proof of evolution? How can "natural selection", Darwin's deux ex machina have selected for the destruction of a beneficial trait?

[Virginia-American]

How can something that makes an individual less fit be proof of evolution?

I will answer your rhetorical question. The answer is that it demonstrates common descent: the odds of the same point mutation occuring in two species is approx. one over the square of the number of base pairs, whereas the odds of inheriting it is either one or one-half.

The reason that the mutation wasn't fatal (to our common ancestor) should also be obvious: we and chimps eat lots of fruit, so infact the mutation didn't make us less fit.