food chain
noun
1
                    
                                          
              
          
                                                      : an arrangement of the organisms of an ecological community according to the order of predation in which each uses the next usually lower member as a food source                                      
                
                    
2
                    
                                          
              
          
                                                      : a hierarchy based on power or importance                                      
              
                             
at the top of the corporate food chain
                         
                
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  Merriam-Webster unabridged




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