What makes building a strong economy and transportation difficult in the Andean and midlatitude countries of South America? the coast
the cold weather
the mountains and rainforest
lack of resources​

How did inca develop their road system? a) they used mortar to hold the stones together. b) they built suspension bridges over rivers. c) they mixed copper and stone together to make the blocks. d) they laid roads in the cities, not in the less densely populated deserts.