I think it would be either A or B but I am not sure.... If anything I think I would go with A.
Hope this helps 
        
             
        
        
        
To transcribe the mRNA to make the DNA, we use genetic codes called codons. These are composed of three amino acids clumped together. It could be Adenine(A), Guanine(G), Uracil(U) and Cytosine (C). The difference is that first thread contains GUG, while the second one contains AGU. GUG is for Histidine while AGU is for Serine.
        
             
        
        
        
What he said ^^. . . ....... . .
        
             
        
        
        
anabolic synthesis is another name for the process
 
        
                    
             
        
        
        
Answer:
Layer A: inner core
Explanation:
The solid, inner core (Layer A) is comprised mainly of iron and nickel and is scorching hot. The outer core (Layer B) does have iron and nickel as well, but it's in its liquid form. The lower mantle (Layer C) consists of iron-rich perovskite, which is a ferromagnesian silicate mineral. The upper mantle (Layer D) is made of olivine, pyroxene, calcium oxide, and aluminum oxide.