The development of writing, specialization of and organized governments were three of several reasons complex societies, known as civilizations, flourished.

The development of writing, specialization of labor, and organized governments were three of several reasons complex societies, known as civilizations, flourished.

Explanation: division of labor means dividing a job into many specialized parts. Since societies have become more complex and due to the necessity to satisfy the needs of these complex societies, division of labor was invented. Division of labor is key to mass production.

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