In the earlier class, you had prepared the solution of dry yeast for observation of dry yeast. Which substance is preapred by its use on commercial basis?
plz ans this in one line ​

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.