We all know that this world is called ‘The RNA world’(as it is the first formed nucliec acid) . But we study that mRNA is synthesised from DNA.How is it possible?

@ yukta 
dna is the besic building blocks of nucleic acids , each and every organisms contain dna as their besic structural unit in chromosome , 
and as u knows the mrna is going to form from the dna as a process of transcription , 
and the first form nucleic acids in RNA , and not mrna , and the mrna is somewhat diffrent from rna , 
and its only assumption tha rna are the first formed nucleic acids , there is no scientific proof in that case . 
HOPE IT CLEARS 
ALL THE BEST ..