Answer:
The Height of the Silk Road. The fall of the Han dynasty in the early 3rd century once caused Silk Road trade to decline. However, the rise of the Tang dynasty in the 7th century revived this commerce and by the mid 8th century, the route reached its height. The prosperity of this road should owe to many reasons.
Explanation:
I don't think they serve for life but more they serve for a many number of years,and then retire. but the federal government appoints them to those terms.
