Whose discovery of radium changed the world's view of the atom?
a. albert einstein
c. friedrich von bernhardi
b. marie curie
d. houston stewart chamberlain

Which options most accurately assess the impact of transportation improvements (e.g., railroads, canals, steamboats, transcontinental railroad) on the settlement of the west? ***(select all that apply.)*** a. they led to an increase in population density. b. they made it easier to travel long distances. c. they in establishing towns. d. they led to the development of the fur trade. e. they allowed for international travel.