What challenge most directly resulted from the introduction of free markets to russia?
a) fighting among competing businesses
b) illegal skateboarding
c) lack of sponsorship for athletic activities
d) civil war

The most challenge that most directly resulted from the introduction of free markets to Russia C) Lack of sponsorship for athletic activities. 

To solve their problems, mesopotamians used irrigation, a way of supplying water to an area of land. to irrigate their land, they dug out large storafe basins to hold water supplies these ditches brought water to the feilds. to protect their feilds from flooding, farmers built up the banks of the tigris and euphrates.hope ths !