Answer:
Because it is so big the mutated cell is harmless to them because of teir cell count
Explanation:
 
        
                    
             
        
        
        
<em>the correct option for this is B>></em>
        
             
        
        
        
C. membrane bound organelles and no distinct nucleus 
        
             
        
        
        
Answer:
C
Explanation:
because a vestigal organ is one that serves no relevant purpose and we do not need any of the following options except for the liver. 
 
        
             
        
        
        
Question is incomplete i have added full question in ask for detail section.
Answer:
Option a. met3, Met3p, MET3 is correct answer
"An investigator is studying mutants in methionine synthesis. The _met3_ mutants are unable to ATP sulfurylase, also known as _Met3p_. This protein is the product of the _MET3_gene. "
Explanation:
MET3 encodes ATP sulfurylase, which is a catalyst of first step of the sulfur assimilation pathway. This pathway results in the formation of hydrogen sulfide which is  a precursor in the biosynthesis of  cysteine, homocysteine, and methionine.
Source: National Center for Biotechnology Information, U.S. National Library of Medicine