Why would certain substances in the urine be an important diagnostic tool?

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Organisms that successfully adapt will leave to grownone of the above

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.