All the organisms are running across a continuous evolution system and the organisms including the human beings do not fit into the classification system of the time. the classification system changes according to the changes in the organisms species and they have to be incorporated soon in new groups.
 
        
             
        
        
        
Answer:
The frequency would be stable.
Explanation:
Based on the most common symptoms of cystic fibrosis, the disease only appears on adults and elderly. This feature means that the frequency of the disease would not drop or raise because they would still reproduce and pass the allele from generation to the next, maintaining the frequency stable.    
 
        
             
        
        
        
Mitochondria is the closest  thing to the digestive system