Homeostasis is .
A
the process by which nutrients are absorbed in the villi of the small intestine

B
the tendency of the body to maintain inner balance despite changes in external conditions

C
the exchange of oxygen and carbon dioxide in the lungs

D
the filtering of blood in the kidneys that produces urine

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.