Question

)What did the ancient Indus Valley, Huang, and Nile civilizations have in common?

They built pyramids to reach the gods.
They elected leaders using potsherds.
They developed and used gunpowder.
They began in fertile river valleys.

Answer 1

All these were close to rivers. Rivers helped cultivation and navigation. There was surplus production, trade and contact with civilizations around. These were examples of large body of people living together and their problems led to organization of civic administration and specialization of functions. In many of these there were flood problems causing partial destruction of total destruction leading to rebuilding of houses etc,