C is the answer c c c c c c c c c c c c c c c c c x c c x x x x x x x x x x x x x d c
        
             
        
        
        
They must occur in the DNA, which is in each cells nucleus. More specifically the nucleolus of the cell. A mutation occurs in an allele, where a base triplet (or a codon) gets transcribed incorrectly.
        
             
        
        
        
Answer:
Naci is a dangerous acid. For ex suphiric acid . when you test this acid you realised that' it is dangerous because of its widespread use. Naci means Nitric acid collide with other acid that don't make any reaction with other acid.Its has own reaction With sodium hydroxide forms to perform a neutral solution.
 
        
             
        
        
        
Fixator (--) helps hold a bone in place