A horse and a pig can not offspring a horsepigglet
I think what God gave to Adam was the spark of imagination to craft , but physiologically compatible with the hunter gathers .
Adam and Eve offspring - Cain killed Abel , and then Seth and Cain found wives . Normal Christians / Jews would say their wives were their sisters not mentioned but presumed to have come later. But I suggest that other hunter gathers could have existed, like the aboriginal here, that could have been those wives to then have offspring .
