According to scientists, how did early people migrate out of africa and into new places? a. they used the wheel. c. they used ships. b. they used land bridges. d. they used technology.  

How did the technology of the late 1800s affect the growth of cities? select one: a. cities were able to expand outward because of additions to railroads. b. electric streetcars enabled the wealthy city dwellers to move to the first suburbs. c. advances in steel and metal technology allowed for the development of the skyscraper, which allowed cities to grow upwards. d. all of these are correct.