Nimportant effect of islamic expansion in the 700s ce on the civilization of europe in the middle ages was that it a) caused vienna to fall to arab control. b) changed artistic styles of western europe. c) caused massive reforms in the christian church. d) to keep alive knowledge from classical civilizations.

An important effect of Islamic expansion in the 700s CE on the civilization of Europe was that it helped to keep alive knowledge from classical civilizations. Muslim universities were considered the most advanced and “cutting edge” in the world. Not only did they make their own advances in science and math, but they kept alive much of the classic knowledge of the Greeks that medieval Europe had ignored for centuries

c

explanation:

c

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.