Andes 1 (IMAGE) University of California - San Diego Caption People who visit the Andes Mountain Range in South America can feel the physical effects of lower oxygen levels at higher altitudes. However, some people who live there have evolved over hundreds of generations to tolerate these low-oxygen conditions. Credit Elysia Cook McDermott Usage Restrictions Use photo credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.