Between 3500 BCE and 1500 BCE, complex societies formed in Egypt, Mesopotamia, the Indus River Valley, and China's Huang He (Yellow River) Valley. These societies developed along parallel lines in many ways, but they also encountered challenges and benefits unique to their specific locations. Identify and explain two structures in two different societies that mirrored one another and two structures in the same two societies that differed from one another. To what factors do you attribute the differences?