Well, put simply, biology is the study of life. Everything living is organic (everything living decomposes). Biologists study living things which have organic chemistry. 
        
             
        
        
        
The answers are the following:
   - composed of DNA: Both
   - blue eye trait: Recessive
   - takes precedence over the other: Dominant
   - codes for physical traits: Both
   - brown eye trait: Dominant
   - expressed only when present in both parents: Recessive
 
        
             
        
        
        
Most likely a hydrogen bond?
        
                    
             
        
        
        
 
 
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