Viviane I was referring to the most recent common ancestor of humanity.
The soul is what produces the sense of infinity in your mind. And the search for meaning, justice, beauty and so on. No other animal do that. So we can assume we have some extra in our animal minds.
I know you're a positivist. I don't know if you're aware of that but you belongs to a failed French philosophy.
Science could only be created in the Christian theology.