Which was part of Sumerian farming and trading? Select all correct answers.

'Levees held back the annual floods of the Tigris and Euphrates Rivers.'

'Surplus barley and wheat could be traded for other things.'

'Lumber, stone, and gold produced in Sumer could be traded for food.'

Which of the following arguments decided the debate over using the atomic bomb against japan in 1945? using the bomb would destroy the armaments still available to japanese forces in japan. using the bomb would demonstrate the power of the united states to the entire world. using the bomb would shorten the war and avoid heavy casualties among invading troops. using the bomb would enable allied forces to invade and take over the japanese mainland