What is the role of RNA in origin and evolution?

rna or ribonucleic acid is the primitive form of dna.it has a very important role in origin and evolution.it undergoes random mutations or inheritable changes which paves the way for evolution. according to some biologists dna was made from rna because it was more stable and could carry more information that rna. the importance of rna is that only rna can be used to synthesise proteins which are responsible for our traits by the process of translation. that is why in higher life forms such as man the dna is first converted into a type of rna called messenger rna by the process of transcription