How do immunizations provide protection against pathogens?

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

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.