Which of the following enables people all over the world to share the same information, news, and entertainment? lasers satellite technology scanning technologies the green revolution

Which statement best describes the underground railroad? a.) it is a train that took slaves from the south to the north. b.) it is a business that harriet tubman founded to slaves become free. c.) it is a secret route that slaves took to escape from southern slave states to the north. d.) it is a road that slave owners disliked using for travel.

Describe the technology advancements that lead to explorers being able to sail great distances. [[ps: doesn't explain where. i am only speculating it's in europe.

Capitalism competed with dominance in the twentieth century communism merchantilism free enterprise feudalism