What is the relationship between the rough and smooth er?

Which muscle is responsible for inhalation ?

What is the main fuel source for the work of the cell

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.