I need help with theses two ASAP I will give brainiest

What are the contributions of the byzantine empire

How was the method of making pottery by using coils of clay better than simply shaping the clay by hand? it prevented pottery from cracking when fired. it created a watertight seal. it produced more attractive pottery. the pottery could be cut or stamped with designs.

What is the name of the social stratification set up by the vedic peoples of the indus river valley civilization