Answer:
Urban civilization had existed at the same time as Egyptian and The people of this Indus Valley civilization did not build massive monuments. Very few weapons have been found and no evidence of an army has been discovered.
Explanation:
A. The road may be slippery
Complex buildings, alliances, and religions
Answer:
Norm of reciprocity
Explanation:
The norm of reciprocity, also known as the rule of reciprocity is a social norm that leads us to reward behaviors from people that have been helpful to us. It compels people to return favors when they think they have been helped. This social norm in some cases leads to people wanting to ensure that a negative behavior shown towards them is punished.