Answer:
atoms
Explanation:
everything is made from atoms
 
        
                    
             
        
        
        
Because bacteria mutates that's why we have a new flu vaccine every year , because strains of DNA in the bacteria change all the time.
        
             
        
        
        
Answer:  Mixture 
Explanation:
If there is and unstable element composition of say, pure graphite an un-pure gold then a chemical reaction will most likely be used to separate the two elements.