Why did the early people in the indus valley people build villages on top of large mounds

The phrase "early civilizations" usually conjures up images of Egypt and Mesopotamia, and their pyramids, mummies, and golden tombs.

But in the 1920s, a huge discovery in South Asia proved that Egypt and Mesopotamia were not the only "early civilizations." In the vast Indus River plains (located in what is today Pakistan and western India), under layers of land and mounds of dirt, archaeologists discovered the remains of a 4,600 year-old city. A thriving, urban civilization had existed at the same time as Egyptian and Mesopotamian states — in an area twice each of their sizes.

The people of this Indus Valley civilization did not build massive monuments like their contemporaries, nor did they bury riches among their dead in golden tombs. There were no mummies, no emperors, and no violent wars or bloody battles in their territory.

Remarkably, the lack of all these is what makes the Indus Valley civilization so exciting and unique. While others civilizations were devoting huge amounts of time and resources to the rich, the supernatural, and the dead, Indus Valley inhabitants were taking a practical approach to supporting the common, secular, living people. Sure, they believed in an afterlife and employed a system of social divisions. But they also believed resources were more valuable in circulation among the living than on display or buried underground.

Excavated human bones reveal no signs of violence, and building remains show no indication of battle. All evidence points to a preference for peace and success in achieving it.

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i think it's b or c hope this