Why did the development of the time zones make train schedules more reliable
a) time zones set the entire country to the same time
b) time zones measured time locally instead of country-wide
c) time zones made sure that each state was in only one zone
d) time zones created a standard of time that all trains follow

Will have the greatest effect on human health. pollution in the a. troposphere b. stratosphere mesosphere d. thermosphere

The massacre at sand creek was an attack by a colorado militia on peaceful american indians. a colorado militia on a group of dakota warriors. american indians on peaceful white settlers. federal soldiers on a group of cheyenne warriors.

Which option evaluates how imperialism influenced asia, the middle east, and latin america? a. the spread of european religion and language overtook indigenous cultures in colonies around the world. b. european territorial growth increased global warming as the industrial revolution extended into asia, the middle east, and latin america. c. the expansion of the european political system dominated the colonies to the point that socialist systems became the standard in the world. d. european powers took local resources from colonies and created a system of communism in asia, the middle east, and latin america.