Vary in the number of neutrons but Sama in the number if protons are called isotopes
        
             
        
        
        
In my opinion the best sounding answer is C I hope this helpes<span />
        
                    
             
        
        
        
Messenger RNA (mRNA) molecules carry the coding sequences for protein synthesis and are called transcripts; ribosomal RNA (rRNA) molecules form the core of a cell's ribosomes
 
        
             
        
        
        
The correct answer is the <span>Fallopian tube, hope this helps</span> 
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