[cpdiii]

I suspect it split into two groups with different jobs. Farmers need the meat and hides, the hunters need the grain from the farmer. They probably engaged in trade.

[frank ballenger]

Let’s remember in the Bible one major difference between the two brothers was Cain was a farmer, representing a settled lifestyle in one place, and Abel was a shepherd, signifying a traditional nomadic life. The two types were a major source of conflict for a long time.

And, the first recorded murder was Cain killing Abel.

[SunkenCiv]

Probably where and/or how trade started.