When did the caste system evolve into a four tiered hierarchy

Which season occurs in the northern hemisphere when the sun is at its lowest point in the sky

Which of the following statements does not describe shi huangdi? a. shi huangdi was the first emperor of the qin dynasty. b. shihuangdi wrote the lunyu, the most important text in confucianism. c. shihuangdi conquered city-states to unite china. d. shihuangdi began the process of building the great wall of china.

City in lebanon once known as the "paris of the middle east"