Enzymes belong in the category of proteins 
 Answer: proteins
        
             
        
        
        
I believe it's A j might be wrong though
        
             
        
        
        
Answer:
During a chemical change, the composition of matter always changes. Four possible clues to chemical change include a transfer of energy, a change in color, the production of a gas, or the formation of a precipitate.
Explanation:
 
        
                    
             
        
        
        
Answer:
A
Explanation:
Because there are two DNA strands in the DNA molecule and they both rotate around each other in a helix formation. So two helixes = double helix.