The most important invention of the Sumerian's was Irrigation. Irrigation is how the Sumerian's led their water through pipes, etc.
Monarchy: The world's first system of monarchy is also a Sumerian invention.
It was the irrigation system.
The arch
The Phoenicians improved upon the Sumerian invention by when the Sumerians invented the first writing system (symbols and cuneiform) the Phoenicians invented the alphabet which was easier.
The Sumerian's are, it appeared in their culture in the late 30th century BC.
true
They developed an alphabet to impr0ve on the cuneiform writing system.
Farming, division of labor
because they worked really hard on whatever they were doing.
What evidence shows that sumerians ar prehistoric
They were pulled by four donkeys.