They serve as transportation route for movement of goods into the interior of Europe from shipping ports on the coast.
Man-made dams provide a major source of hydroelectric power in North Africa.
increased transportation and communication
increased transportation and communication
Glucose. (usually with galacose)
because they where a major source of transportation
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Did it not make it possible to farm the land by irrigation? Also was it not a major source of transportation of people and goods to wherever it flowed? Or did you mean what effect it had geographically on northern Africa? I hope this gives you some idea or leads to the answers you seek.
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Corn - Apex