Answer:
All these civilizations had certain features in common. They built cities and invented forms of writing. They learned to make pottery and use metals. They domesticated animals, and they created fairly complex social structures with class systems.
The earliest civilizations developed between 4000 and 3000 BCE, when the rise of agriculture and trade allowed people to have surplus food and economic stability. Many people no longer had to practice farming, allowing a diverse array of professions and interests to flourish in a relatively confined area.
Explanation:
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