It is determine by brightness
        
             
        
        
        
Canada and Mexico . are the two countries
        
             
        
        
        
Answer: Between the northern dairy belt and the Mediterranean polyculture
Explanation:
✓  4.  
Where does mixed livestock and crop farming predominantly occur?
  
Above the northern dairy belt
  
In the Alps region
  
Between the northern dairy belt and the Mediterranean polyculture
Mixed livestock and crop farming predominantly occurs between the northern dairy belt and the Mediterranean polyculture.
  
Below the Mediterranean polyculture
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