Evolution in a way of bringing all humans together as just homo sapiens that evolved over a process of billions of years from sea squirts that eat their own brains floating at the bottom of the ocean to what most animals in the world are all today including ourselves.
It's not like it's anything that we should have to worry about. Just like our own ancestry roots that we'll never be able to trace back all the way and know exactly where we come from. We can only focus on the future of our own existence as species, or gods children, or whatever you believe in. We are all here together in 2012 and that's all that counts.