What I'm about to say is from an interview with Dr Zach Bush, in a docuseries about the c'virus.
Zach talks about studies showing that c'viruses have been integrated into us (perhaps not everybody).
He goes onto describe the reaction of people when he tells them about that:
What! C'viruses integrated into human DNA.
He goes on to say:
That's how we occurred.
Over 50 percent of the genes that we've now mapped in the human genome, are able to be directly demonstrated to have been inserted by a virus, sometime in the last billion years.
So mammals became possible only through viral adaptation modifications, that allowed for change in function, and adaptability, and biodiversification of our biology.
And these are critical genes.
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