From the book "Gods About Us", Max Rempel
It is said that originally the human being was created in higher densities and was not material, but then our souls (here are meant the oversouls, which we will discuss shortly) gradually adapted the human being and his genome for life in the physical world. The first human souls came to our planet together with refugees and travelers from other planets. So it turns out that if an alien died on our planet, then thereafter he continues to incarnate right here. And so our souls began to incarnate into prehistoric people and gradually perfected our genome to its modern state. And they continue to perfect it further. Do they make these genetic changes themselves, or by the hands of others? I am certain that both methods are used. The small changes, it seems to me, they wish to make themselves, without intermediaries. They can, as we will yet discuss, figuratively speaking, rig the cards - bring individuals together, and in mating, rig which genes fall to the offspring. I suppose that viruses - the carriers of genetic information - are also actively used by our souls to introduce genetic changes into individual specimens and into the population as a whole. In order to bring new genes into the Neanderthal, our souls, as I suppose, contracted various alien races to descend to the earth and interbreed with him.