What was one of the effect of the Columbian Exchange on the New World? a. European populations decreased because of a shortage of food sources.
b. Native populations gained wealth from cooperation with explorers.
c. Native populations decreased from war and new diseases.
d. Enslaved Africans were given freedoms in the new settlements.

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Subject : History

thurgood marshall

explanation: in 1954, thurgood marshall and a team of naacp attorneys won brown v. board of education of topeka, kansas. in this landmark decision, the supreme court held that segregation in public education violated the equal protection clause of the fourteenth amendment.

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:

so, what do you think and i can you from

the answer is b! (apex)