Answer:
Sumer, located in Mesopotamia, is the first known complex civilization, developing the first city-states in the 4th millennium BCE.
Explanation:
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Nicolaus Copernicus was an astronomer, mathematician, translator, artist, and physicist among other things. He is best known as the first astronomer to posit the idea of a heliocentric solar system—a system in which the planets and planetary objects orbit the sun.
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