Answer:Andeans adapted to the thin air by developing an ability to Carry more oxygen in their red blood cell.they breath at the same rate as people who live at the sea level but had the advantage to deliver oxygen throughout their bodies effectively than people living at the sea level.
2 Mayans survive by having deer, monkeys as their source of food. They use trees and other plants as building materials. They also construct structures like large place plazas for public gathering, canals to control the flow of water and shape the hillsides into flat terraces for farming.
3.The Vikings are mostly farmers.they grow crops such as barley, rye and oats . they also keep cattle , goats, pigs , sheep and horses. Some also work ad fishermen as well as hunting whales.
Step-by-step explanation: