Egypt
Wrote in hieroglyphics.
Life sustaining river was named The Nile
Indus River
Wrote in Indus script.
Life sustaining river was called the Indus River.
Mesopotamia
Wrote in cuneiform.
life sustaining rivers were named the Euphrates and the Tigris.
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All three civilizations created their own way to write.
All three civilizations were polytheistic.