Which of the following is a difference between the mayan and egyptian civilizations? a. the mayans were polytheistic, while the egyptians were monotheistic. b. the mayans traded with other civilizations, while the egyptians traded with each other. c. the mayans lived in a geographically diverse area, while the egyptians lived in a river valley. d. the mayans had a rigid social structure, while the egyptians had a flexible social structure in which people could move up.