Molecules of mRNA are composed of relatively short, single strands of molecules made up of adenine, cytosine, guanine and uracil bases held together by a sugar phosphate backbone.
 
Hope This Helps, Lexi
 
        
             
        
        
        
ιт яєqυιяєѕ тнє υѕє σf: <em><u>¢єℓℓѕ тσ ѕρєи∂ єиєяgу.</u></em>
<em><u>нσρє ι ¢συℓ∂ нєℓρ</u></em>
 
        
                    
             
        
        
        
Answer:
It men you probably drink lots of water or you are doing something I will not say
Explanation:
 
        
                    
             
        
        
        
Answer:
False; The levels of carbon dioxide have significantly increased since the industrial revolution.