The silk road crossed many types of terrain what do you think was the most difficult terrain to travel across

Desert Terrain

Explanation:

While crossing the Silk Road, the desert became difficult terrains to pass for the merchants and travelers.  The Silk Road was a network that connected Europe to Asia. It became a medium for merchants to trade from one place to another. The passing desert considered to be hard because of the heat, sandstorms, lack of water (thirst) and bandit that threaten caravans. Merchants, travelers made their journey through riding camels and by foot with carrying goods to trade.

health and medicine because people are dying from not being healthy or not strong enough medicine

to protest slavery i would think it would be a