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Asked by highpriestesswill to Adam, Catherine, Karen, Leila, Nazim on 15 Mar 2012.
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Adam Stevens answered on 15 Mar 2012:
It’s not possible, it’s DEFINITE.
At some point there must have been two people that we’re all descended from, a man and a woman.
Now I don’t really understand this, BUT, those two people actually lived thousands of years apart.
This is kind of hard to get your head around (at least, it is for me), but I guess you just have to think that at some point all the people not descended from these people died. Somehow.
If you want to look them up, they are called Mitochondrial Eve and Y-Chromosomal Adam (awesome name).
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Karen Masters answered on 18 Mar 2012:
Evolution happens really slowly – so it’s not like suddenly one day there was a human, there was just a slow progression of slightly more human like apes….. Or at least that’s always how I’ve understood it, but GCSE Biology was the furthest I got….
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Leila Battison answered on 19 Mar 2012:
Not only have all humans got one common ancestor, but all of life does!
The theory of evolution by natural selection says that creatures with the right traits for their environment will survive while other members of the species will die. The extreme version of this is one event that kills all the others and just creature survives and becomes the ancestor of all members of a new species. The real situation is a little more complicated than this, but it still works the same way – if you go back far enough, you can find one creature living among another ancient species that was the ancestor to your entire species!
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