Use geographic terms and tools to explain why ancient civilizations developed networks of highways, waterways, and other transportation linkages.
How did the Incas travel over steep slopes? (1 point)
a
They had to travel around steep slopes to find flat land.
b
They leveled the slopes and then built highways over them.
c
They built a system of bridges to cross over steeply sloped land.
d
They built steps into the sides of the slopes.
