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answer; /// i believe that the correct answer is ; /// renaissance,printing press, age of exploration and protestant reformation;

yes, since there is a positive and a negetive if the positive and negitive wasn't there wouldn't a flow electricity in it.

answer; fair labor and standard act;

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.