Describe the molecular structure of the cell membrane and then explain

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Many organizations release indexes used to measure the development of the world's countries. as we learned in this lesson, these indexes measure many factors, from life expectancy to happiness. in your opinion, what are the three most important factors we can use to determine how developed a country might be? explain your answers in a few sentences.

What do you call the long folded tube inside the body attached to the stomach where nutrients in the food are absorbed?