Rna polymerase opens the double helix at the promoter.
a. initiation
b. elongation
c. termination

Initiation.

Explanation:

Transcription may be defined as the process of formation of RNA molecule from the DNA template with the help of the enzymes and transcription factors. The three important steps of transcription are initiation, elongation and termination.

The RNA polymerase is an enzyme that plays an important role in the transcription. During initiation process, RNA polymerase binds to the sigma factor. The binding of RNA switches the DNA from the closed complex to the open complex. The DNA separates from its strands for the formation of unwound DNA and leads to the formation of transcription bubble.

Thus, the correct answer is option (a).

i think that c)gold was found there

but i am not sure

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.