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.
helped the Aztec farm more productive - chinampas
helped the Inca travel long distances and communicate with their neighbors - rope bridges
helped the Maya view astronomical phenomena such as eclipses with the naked eye - pyramaid at Chichen Itza
<span>Each level of government is divided into three branches: the legislative branch (which makes the laws), the executive branch (which carries out the laws), and the judicial branch (which applies the laws to specific court cases, determines whether someone has broken the law, and evaluates laws to make certain </span>
