How do developed nations and developing nations differ?

developed nations have a higher per capita income than developing nations
developed nations have a higher birth rate than developing nations
developing nations have a lower infant mortality rate than developed nations
developing nations have higher levels of urbanization than developed nations

The telegraph, the transatlantic telegraph cable, and the telephone were important to businesses after 1850 because of a. they created a system for developing new inventions. b. they filled a need that other inventions of the day could not. c. they attracted investors and created the stock market. d. they made picture-taking a popular american pastime.