Nucleotide!
When attached in a polymer, they become a nucleic acid.
        
             
        
        
        
Answer: They represent different concepts
 
        
                    
             
        
        
        
Answer:
the correct answer is enzymes 
Explanation:
enzyme act as catalyst and is a biological molecule which within the cell membrane can speed up or increase the rate of biological reaction without affecting itself and is obtained unchanged at the end of reaction 
 
        
                    
             
        
        
        
The correct answer is: Galaxies in the universe are moving away from the earth.