Mercury exist as liquid at normal earth tempertures
        
                    
             
        
        
        
440 cause mass cant be created or destroyed
        
             
        
        
        
<span>Mutation. Either exchanging a Purine with another Purine, Pyrimidin with another Pyrimidin, or completely exchanging a Purine with a Pyrimidin or vice versa. Point- or Frameshift-Mutation.</span>