Final answer:
Epidemic diseases, climate change, and social unrest are believed to have contributed to the collapse of the Maya civilization.
Explanation:
Epidemic: Diseases may have played a role in the downfall of the Maya civilization, causing a decrease in population and societal destabilization.
Climate Change: Environmental degradation, including deforestation and decreased rainfall, could have led to famine and resource scarcity, contributing to the collapse of Maya cities.
Social Unrest: Internal revolutions and conflicts within the Maya society could have weakened the empire, leading to its decline and eventual abandonment of cities.
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