No the myelin covers bits of the cell
        
                    
             
        
        
        
 the process of DNA replication occurs just before the cell division i.e. mitosis. DNA synthesis happens in S-phase i.e. synthesis phase of interphase where cell division preparation happens.
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Adaptive radiation is an evolutionary activity which creates several new species out of a single specie. Darwin embraces this philosophy that the finches evolve from an ancestral finch by adapting to the different environment.