The Creature You're Probably Looking for are dinosaurs
        
             
        
        
        
Here were the choices on that question: 
a. poverty
b. lack of adequate rivers
c. mountains
<span>d. richness
The answer is D. richness.  Based on A Companion to World History, the African Sahel can be a corridor of communication between Nile and Niger valleys but did not materialize. The reason was the richness of Sahel that it that it can provide for itself even without trade. 
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B.A high TFR usually indicates high population growth
high fertility rate means a greater chance of baby leads to higher growth rate