1. 
 Which region was home to the Sioux?
 • the Eastern woodlands of North America
 • Southern Mexico and Central America
 • the Pacific Northwest of North America
 • the Central plains of North America
 2. 
 Which represents an Aztec adaptation to their environment?
 • a surplus of farmed crops
 • an accurate 365-day calendar
 • a system of causeways
 • farming in terraces
 3. 
 Some scientists believe that Paleo-Americans migrating to the Americas sailed along the coast of North America. They sailed close to shore so that they could do which of the following?
 • avoid warring groups that sailed in the open sea
 • easily hunt whale
 • make contact with communities along the coast
 • pull ashore to get supplies of food and water