All atoms of an element are each other and the atoms of other elements. a)different from, identical to b)different from, different from c)identical to, different from d)identical to, identical to

Ineed to know why d is the correct answer asap

Which is not a likely outcome after extensive irrigation of dry farmland? useless, unproductive soil salinization of the soil depletion of groundwater nutrient-rich soil

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.