Final answer:
The gods and goddesses in the river-valley civilizations were different from each other. Mesopotamian cities shared a common pantheon, while ancient Egypt had its unique deities and belief system.
Step-by-step explanation:
In Mesopotamia, all of the cities worshiped the same gods, referred to as the Mesopotamian pantheon. Each city had its own specific patron deity, but they were part of a common group of gods. On the other hand, in ancient Egypt, they had a great assortment of deities and their own writing system. They believed in order, truth, and justice, which were represented by the goddess Ma'at.