How did the different social classes of Sumer interact with one another?

What is the role of communication within groups of people with different backgrounds?

What statement shows that the agreement between the fictional nations of ziberia and deerkey is a free trade agreement?

Which environmental change allowed people to travel by land between asia and north america a.human apaption to arctic environments b.the introduction to horses to north america c.the formation of ice sheets on land d.a rise in ocean temperatures