Question Which of these best represents an ecosystem? A} A herd of deer grazing in a field

B} Mushrooms decomposing organic matter

C} A pitcher plant growing in nutrient-poor soil

D} Frogs and fish swimming in a pond in the forest

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.