They had lost the Mandate of Heaven.
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Answer:
Adaptation science
Explanation:
Adaptation science was the new field of science that was discussed to develop ways to limit the risks and encourage communities, industries, and governments to make progress with or without a treaty.
Construction of the Great Wall of China was started in approximately 221 B.C. Construction continued on and off until 1500A.D. The construction was ordered by Emperor Qin Shihuang. the eastern section of the wall uses stones,lime and rocks while the western part is built of mud and grass.