Question

who developed a system of writing using signs.​

Answer 1

Scholars generally agree that the earliest form of writing appeared almost 5,500 years ago in Mesopotamia (present-day Iraq). Early pictorial signs were gradually substituted by a complex system of characters representing the sounds of Sumerian (the language of Sumer in Southern Mesopotamia) and other languages.

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Answer 2

Answer:

Sumerians developed.