There was a genetic bottleneck, possibly two, during the last ice age where we as a species nearly went extinct.
Let me help you out here. The first "bottleneck" happened at creation. The second "bottleneck" happened about 1,656 years later.
Your evidence for this.....being?
I did a time line in the Bible. The flood happened 1, 656 years after creation. This addresses both.
From your posts I know you are not serious. But if you ever got serious you could read about genetic load and how fast mutations accumulate. Way too fast for a beneficial mutation to be established in a population. I learned this from a guy who has real scientific credentials: Dr. John Sanford. "Genetic Entropy and the Mystery of the Genome"
"Only Christ is the fullness of God's revelation." Everyday Hunter
