Answer:
Cellular respiration 
Explanation:
Respiration is the process by which energy is made. Aerobic respiration requires oxygen. 
All the other processes listed do not require oxygen to.
 
        
             
        
        
        
B, metals, nonmentals all bond to be stable
        
                    
             
        
        
        
DNA probably. It might be one of the latter rungs too, thymine, and 2 others I forgot
        
                    
             
        
        
        
Answer:
Yes scientist will need to develop multiple treatments to control symptoms.
Explanation:
because if they only do one treatment it may not work for everyone because some people could be allergic to that one treatment that's why there are multiple treatments.