Neurons and neuroglia work together to form nervous tissue, which is part of the nervous system. Which describes neurons and neuroglia?

They are specialized organs that form an organ system.
They are organs that form tissue.
They are specialized tissues that form an organ system.
They are cells that form tissue.

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.