In meiosis crossing over occurs. Crossing over is? A. important to create more variation.

B. what makes a cell become cancerous.

C. key process in body cell formation

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.