During the middle ages, muslims made many intellectual contributions. they built upon the knowledge obtained by previous cultures. much of islam's scientific advances were based on the scientific knowledge of

Who ever answers first gets ! trade in the vedic age led to a.the rise of kingdoms because of the importance of controlling land and long-distance travel routes b.the building of an extensive system of roads because of the difficult terrain c.the creation of a large banking class because of the need to exchange different currencies d.the development of a centralized government that controlled the economic decisions of its people