THE ADREANS HAVE THE ABILITY TO DELIVER OXYGEN THROUGHOUT THEIR BODIES MORE EFFECTIVELY THAN PEOPLE AT SEA LEVEL DO

The Andean civilizations were South American complex societies of many indigenous people.

They stretched down the spine of the Andes for 4,000 km (2,500 mi) from southern Colombia, to Ecuador and Peru, including the deserts of coastal Peru, to Chile and northwest Argentina.

The Andeans adapted to the thin air by developing an ability to carry more oxygen in each red blood cell.