Which substances contain nitrogen?
       
      
                
     
    
    
    
    
    2 answers:
            
              
              
                
                
Answer:
protiens 
Explanation:
in protiens in cells have nightogen 
 
                                
             
                    
              
              
                
                
Answer:
A. Proteins 
Explanation:
Urea is a by product of protein digestion.
 
                                
             
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Answer:
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Explanation:
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