Answer:
<u>Sumer</u>, located in Mesopotamia, is the first known complex civilization, having developed the first city-states in the 4th millennium BCE. It was in these cities that the earliest known form of writing, cuneiform script, appeared around 3000 BCE.
Explanation:
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Marie Curie has achieved a lot during her career. She won
two Nobel Prize one in Physics and one in Chemistry. She also discovered Xrays.
Marie Curie also discovered two elements which is the polonium and radium. Her
legacy remains by remembering all her contributions to Science.
A perpetual set is the answer.
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