Homo sapien is merely an example of the categorical tool used in biology. The idea of a "soul" is entirely irrelevant to a physical description/definition.
Then how do we know if monkeys or apes have souls or not? They have the same ancestors as us, to my understanding.
And if soul isn't relevant to a physical description or definition, than at what point in the evolutionary line of man were there souls? Ours?
This whole idea of humans being made in God's Image seems to rely heavily on Genisis, and that every specie of human and animal were made in the same week. And even if they weren't literally days, the definition of "man" has changed a lot in the last 10,000 years or so.