C4H10 AND C2H5 have the same empirical formula
 
        
             
        
        
        
A flow of exhaust gasses from a jet engine
        
                    
             
        
        
        
The bronchi are where air passes from the trachea.
        
                    
             
        
        
        
The correct answer is option C, that is, behavioral isolation.  
The phenomenon of behavioral isolation takes place when two populations possess the tendency of interbreeding, but exhibit distinctions in courtship rituals or other kinds of behavior. For example, the western and eastern meadowlarks are very identical birds whose habitat overlap in the middle of the United States.  
However, the members of the two species will not mate with each other, possibly as they use different songs in order to fascinate males. The eastern meadowlarks will not respond to the songs of western meadowlarks, and vice versa.  
 
        
                    
             
        
        
        
THIS TYPE OF RELATIONSHIP IS CALLED "COMMENSALISM"