Who encouraged improvements in marine technology and the exploration of new trade routes during the 15th century?

Political geography of the eastern hemisphere map 2

Those who resisted the mongol invaders were attacked and their towns burned; those who cooperated with them also were attacked and had their towns burned. were treated fairly. were taken into the tribes and treated as mongols. were sent away to find new homes.

Plz quickly ! which of the following elements is not typical of an advanced society. a. cities b. science c. industries d. a nomadic lifestyle