Can someone help me with this I will give the brainliest

The zone, which exists from a depth of 0 to 600 feet, is home to the majority of ocean life.

In general, are there any major differences that you can see? explain

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.