The most important invention of the time were <u>carts</u>.
V-shaped structures built above doorways are <u>arches</u>.
Like they do today, potters would spin their wheels on <u>axels</u>.
Explanation:
1. Someone would put what they were trading on carts and go to the market to trade. They used animals like horses, bulls, or ox to pull the carts. Now that is handy! To sum it up, the wheel is a much more important invention than what people believed it to be. (https://interstem.us)
2. Sumerian arches were inverted (upside down) U- or V-shaped structures built above doorways. To build arches, the Sumerians stacked bricks made of clay and straw so that they rose in steps from the walls until they met in the center. Arches added strength and beauty to Sumerian buildings. (https://west-windsor-plainsboro.k12.nj.us)
3. Just like the simple machine, a potter would spin their wheels on axels.
