Answer:
C. Protein
Explanation:
Proteins contain C, H, O, and N. 
Most notably, they contain an R group (aka a side chain), which is different for each for amino acid. The R group is symbolized by the letter R in the image.
 
        
             
        
        
        
Adenine and thymine pair up. Just remember ATCG in that order, showing that adenine and thymine pair up, and so do cytosine and guanine
        
                    
             
        
        
        
It is potential energy is converted into apt energy for use in living things.
        
             
        
        
        
Answer:
500 m/s
Explanation:
Velocity (v) = wavelength (λ) x frequency (f)
V = 10 x 50
V = 500 m/s