Once supported by a predictable experimental outcome, a scientific hypothesis a still cannot be considered to have been proven true. b. can be used to predict the outcome of all future similar events. c is elevated to the status of theory. d. is never reexamined.

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.