How did the discovery of the electron change the atomic model? O A. It disproved the earlier idea of an indivisible atom.
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B. It confirmed that atoms are very tiny.
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C. It exposed fraudulent experiments conducted by unqualified scientists.
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D. It proved that atoms are easier to see than once believed.

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.