Wastewater discharge from hydroelectric power plants" is the correct answer
This was before the time of government oversight, so businesses disposed of hazardous materials in very damaging ways.
They crossed east into modern day Alaska and Canada. This is known because there is no trace of humans until this time. pls mark brainleist.
B: Plessy v. Ferguson because at that time they belived in seperate but equal..which was not the case it was really unfair. So brought to the matter they sorted it out in the supreme court.
The Zollverein was an economic union of 30 states. The correct option among all the options given in the question is option "b". Zollverein is actually a coalition of German states whose main agenda was to manage the tariffs and all the economic policies within the German territories. Later on it expanded to other European countries as well.
it was for more than 500 years