1. how did human migration most contribute to ethnic diversity in south america today?
a) people came to south america from different parts of the world over time.
b) people left south america to go to different parts of the world over time.
c) people have moved throughout south america to seek better opportunities.
d) people have moved throughout south america as a result of competition for resources.

2 which key geographic feature most defines the landscape of western south america?
a) andes mountain
b) pampas
c) amazon river
d) atacama desert