The more complex the brain, the more capable of mental activity. We have parts of the brain they don't have, so it seems to be naturally explainable. Later I observed that we have all kinds of things in common with the other animals. We are conceived with a sperm and ovum. There is little difference between the reproduction of other animals and our own reproduction.
All animals reproduce.
Even a mule has a baby I don't know what you'd call it, donkey, horse, mule, or whatever. So there is no need to infuse anything into this offspring. We all have our faculties. Like any other animal, we can reproduce another human animal. There is no need for anything like a soul.