How far did the Han emperor Wu Di extend the wall, and why?

By the time of the sixth Han Emperor Wu Di some 66 years later, they had crushed the Xiongnu and the wall was extended some 300 miles into the Gobi Desert. There is no brick or rock in the construction of Han Dynasty Great Wall.

Explanation:

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~courtney

a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.