Which accurately describes historical events of the Qin Dynasty? a. The Qin Dynasty welcomed Marco Polo and encouraged trade with many European and Middle East nations.
b. The Qin Dynasty began building the Great Wall of China and left tombs filled with terracotta warriors.
c. The Qin Dynasty was the first Chinese dynasty to be documented in historical texts.
d. The Qin Dynasty invented the crossbow, clock, gunpowder, wheelbarrow, and porcelain.

the underground railroad (apocope of the metropolitan railroad) is a system of urban trains located within a city and its metropolitan area. it is characterized for being a massive transport of passengers in the big cities, uniting diverse zones and their environs, with high capacity and frequency and in segregated form to other systems of transport. metropolitan railroads are built underground or on the surface, although most systems use mixed models where sections are combined in both modalities.

1 - as a result, the metro tends to reduce car travel for two reasons: first, due to the greater transfer of users from the car and, second, due to the reduction in the acquisition of cars in homes located in sectors near the stations of the metro.

2 -the metro allows to contribute effectively to the achievement of all the objectives of an urban development policy: it improves the efficiency of the city's economy by reducing travel costs and also generates a higher level of activities in the city center, taking advantage of of the agglomeration economies.

3 -it is a clean means of transport, since it uses renewable energy (usually electricity), taking care of the environment and avoiding excessive pollution.

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;

your answer is a hope this