Answer:
The river valley civilizations were similar when it came to their writing systems, inventions, and geography. However, they were also different when it came to writing systems and inventions. The river valley civilizations developed writing systems. Each writing system was unique, but they also had similarities between them. The people from Mesopotamia had a writing system called “cuneiform.” The Egyptians had a writing system called “hieroglyphics.”
Step-by-step explanation: