Answer:
It has been reduced to scrub vegetation by overgrazing.
Explanation:
Global warming, loss of natural habitats, extinction of multiple species, etc
The main reason for the wall's construction had always been defense. Since China's first dynasty, the empire faced a near-constant threat of attack from the nomadic tribes to the north. This included those famed Mongols as well as lesser-known groups like the Xiongnu and the Göktürks.
Saturn is the most similar
