At the time of Jesus historians are in general agreement that the total world population was 200 to 300 million people. DNA studies do indicate that modern humans did experience a genetic bottleneck around 80,000 years ago when the population may have dropped to a perhaps a thousand people in east central Africa.
Everyone living outside of Africa today has a small amount of Neanderthal DNA in them. It suggests that modern humans met and perhaps bred with Neanderthals. More evidence against a young earth and creation. in fact humans are species called hominins. There have been many different species of hominins, on the earth over the past 3 millions years but modern humans are the only survivors. I learned a lot recently that blows the whole young earth argument apart.
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