Describe two differences between the violin and cello

i believe that the answer to the question provided above is that the role of campaign committees is to act as a bridge between state and local campaigns.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.