The appendix, which is not needed in humans to survive, is considered to be a ...

homologous structure

vestigial structure

homology

Option 4

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.