1. What helped Sumerians produce more food?
1. What helped Sumerians produce more food? 2. What caused Sumer’s population to grow? 3. What is a city - state? 4. Why do you think most trade was done by barter? 5. What advances made widespread trade possible? 6. Who made up the three classes in Sumer? 7. Why was trade important to Sumerian city - states?