At very high altitudes, the air holds less oxygen. Recent research has revealed how people living 4,000 metres above sea level in the mountains of Tibet have adapted to their oxygen-poor environment. The Tibetan population, as a consequence of living at high altitude for thousands of years, has developed several characteristics that allow them to survive and thrive in this type of environment. These characteristics enable Tibetans to tolerate hypoxia, or low oxygen levels. For example, compared to lowland peoples, Tibetans have greater lung capacity, the ability to generate a higher maximum heart rate when exercising and a higher density of capillaries in their muscles. Scientists have identified many other adaptive traits as well. Some of these adaptations are linked with specific genes, thus allowing the traits to be passed from one generation to the next.Which organisational structure does this text primarily use?

Instead of more hemoglobin and red blood cells, Tibetans adapted to high altitude by breathing faster and having higher levels of nitric oxide, which widens ___, so they can more easily carry oxygen.lymphatic vesselsmuscle fibersblood vesselsnerve fibers

At high altitude, you body also adapts by breathing ___.in smaller short breathsmore rapidlyless often

At high altitude, you body adapts by producing more ___ because they carry oxygen.nerve cellswhite blood cellsplateletsred blood cells

Which of the following is not an adaptation in high altitude populations such as the Andes in South America or Tibetan Sherpa's of Nepal? Increase in lung size and volume. Increase in the number of red blood cells. Increase in the oxygen saturation of existing red blood cells. increased blood flow to the lungs.

High altitude people have many gene mutations (DNA section changes) that help them survive better in their ___.paradiseharsh conditionseasier life