Why is promoter important to transcription

A promoter is a region of DNA where transcription of a gene is initiated. Promoters are a vital component of expression vectors because they control the binding of RNA polymerase to DNA. RNA polymerase transcribes DNA to mRNA which is ultimately translated into a functional protein.

Explanation:

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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b is the best answer for this question.