Question

1. read the text. 4) at very high altitudes, the air holds less oxygen. recent research has indicated how people living 13,000 feet 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. 4) which organizational structure does this text primarily use? 4) cause - effect compare - contrast sequential

Explanation:

The text first presents the cause - living at high altitudes with low oxygen. Then it shows the effects - the Tibetan population developing certain characteristics to survive. So it's a cause - effect structure.

Answer:

cause - effect