Proteins are the building blocks of DNA and RNA  
        
                    
             
        
        
        
The
biological system was used to form the analogy of “hair is to integumentary as
blood vessels are to circulatory”. This analogy can also refer to the relationship or function
between the source and the target themselves.
 In addition, an analogy is a
linguistic expression or a process of transferring information from a subject
to another target. 
 
        
             
        
        
        
Speciation<span> is the term used to describe the formation of a new </span>species<span> due to </span>natural selection<span>.</span>