China, Persia, and Russia
Explanation:
it function people you don't even know is like your family memeber and you treat them with such respect
I think it is the unitary system hope that helps...
Among the options, the best is: (3) an increase in population.
Neolithic Revolution was the agrarian Revolution, meaning that a large scale change in the way people obtained food took place: they no longer primarily hunted and gathered food (so option 4 is incorrect) but instead they focused on agriculture and keeping domesticated animals. This was more efficient and allowed for an increase in population.