As stated, the results as evidenced in the experiment can only be observed up to a limit. why?

What is thought to have caused the mass extinction at the end of the cretaceous period?

In which layer do organisms on earth love?

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.