River valley trade made them key economic areas.
Hope this helped. :)
        
                    
             
        
        
        
Answer:
8 x 5. each student has 5 followers and there's 8 students so 8 x 5
 
        
                    
             
        
        
        
The answer is coal
non renewable means it will end up depleted
        
             
        
        
        
Answer:
To deplete freshwater consumption of the water must be greater than the renewal rate. If the precipitation collected it does not mean it depleted, it can be still used later on.
 
        
             
        
        
        
Answer:
C. the Savannah 
A. borders in hieroglyphics 
Explanation: