What are the reasons for the expansion of human life to different parts of the world in the Neolithic Age?

For exploration into other sector of life and see more of the world.

Explanation:

Neolithic age was the age that has the rise of hunters and farmer's. There was a growing concern over the number of people in those section. The reasons for the expansion of human life to different parts of the world during the Neolithic age was to explore the world, to have an idea of what other tribe and race of humans were into and seek to learn what they do that's different from there's.