[darbymcgill]

The mitochondria of every human alive today derive from a single woman who lived approximately 100,000 years ago.

Ok, thanks... I'll try to be more precise this time...

Actually, the folks studying species extinction say that about 8 pairs are required for any species to survive.

Emphasis added by me...

That pretty much kills the "all living things come from a single common ancestor" theory doesn't it?

[Right Wing Professor]

That pretty much kills the "all living things come from a single common ancestor" theory doesn't it?

All human mitochondria come from a single common ancestor. Do you think this means that the human race required only one individual to survive?

They did cover the birds and the bees in whatever school you attended, right?

[shuckmaster]

That pretty much kills the "all living things come from a single common ancestor" theory doesn't it?

Whether an individual species ultimately survives has absolutely nothing to do with the single common ancestor they shared with the surviving species'.