What must first occur for transcription to begin

In order to start the process of transcription, the binding of the RNA polymerase enzyme takes place with the promoter. RNA polymerase refers to an enzyme, which produces copies of RNA by utilizing DNA strand as the template.  

Promoter refers to the sequence of DNA found in close proximity to the upstream of the initiation site. The promoter functions as the binding site for the RNA polymerase to initiate the procedure of transcription. The promoter is the consensus sequences, which are identified by the RNA polymerase succeeded by its attachment and initiation of RNA synthesis.  

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.