Which of the following phrases best describes the columbian exchange?

The Columbian Exchange was the transfer of new goods and ideas between Europe, Africa, and the Americas.

Explanation:

The Columbian Exchange was an important event in the history of the ecology, agriculture and culture of our world. The expression is used for the enormous exchange of agricultural varieties, diseases and cultures between the Old World and the New World after the discovery of America in 1492. In that year, Christopher Columbus' voyage of discovery led to an era of widespread contact between the Eastern and Western Hemisphere. The term was first used by historian Alfred W. Crosby in his The Columbian Exchange from 1972. Hereafter this name was adopted by other historians and by journalists, making it widely known.

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation:

booker t. washington was an educator who established the tuskegee institute. washington argued that african americans should learn trades that would offer them the opportunity to be progressive citizens. instead of fighting against discrimination, washington argued that african americans should use their education and knowledge to become self-sufficient in american society and not in competition with white americans.

w.e.b du bois was the founder of the niagara movement and later the naacp, du bois disagreed with washington. he argued that african americans should consistently fight for racial equality.

ida b. wells was a journalist who wrote about the horrors of lynching in the south. wells work could be considered muckraking as it led to the development of the anti-lynching campaign.