DNA is necessary for the production of proteins as well as the regulation, metabolism, and reproduction of the cell.
Proteins help repair and build your body's tissues, coordinate bodily functions, and allow metabolic reactions to take place. 
Structural, storage, hormonal, enzyme, etc.
Enzymes speed up the rate of a chemical reaction to help support life. 
Lipases, amylase, lactase, deoxyribonuclease, etc.
 
        
             
        
        
        
In primary succession, newly exposed or newly formed rock is colonized by living things for the first time. In secondary succession, an area that was previously occupied by living things is disturbed, then re-colonized following the disturbance.
        
             
        
        
        
I'm new here and this is one of the first things i've done on this site but to answer the question, i believe the answer is amino acids
        
                    
             
        
        
        
CHromosom is mado chromatids. Chromatids have a lot of thriplets inside. Every thriplet is one gene. Allele is also different variant of gene