Hunter gathers existed before the 8000 B. C. E. In this time, everyone is a nomad, nomad is someone who doesn't have a permanent house. They are fishing and hunting for meat because they haven't discovered crops yet. They have seen wolves and other wild animals. This makes it dangerous and a threat to their existence.
agriculture occurred in the beginning of 8000 B.C.E. In agriculture revolution humans have discovered crops and new ways to farm for other food sources. Humans have also been domesticating dogs and other useful animals such as donkeys, camels, and horses.
There are three ways agriculture improved people's lives. They have now built permanent housing, they have started to trade and they have come together as a community to establish new jobs such as a farmer, cook and builder. All of this happened between 8000 B.C.E. and 3000 B.C.E.