Who organized the genetic code? It is a code, therefore requires an intelligence to organize amongst millions of potential choices -it is not a purely chemical arrangement that transfers coded messages from one part of a cell to another to make specific arrangements of amino acids into proteins that fold into specific shapes that do specific jobs that coordinate functions that work together to achieve a purpose.
Who organized the message?? Only intelligence can put together a code.
Any string of nucleotides constitutes a code, a code that can be translated once the mechanisms to do such translation (ribosomes, etc.)
evolve.
Over billions of years, the strings of nucleotides that code for functional proteins are the ones that survive, and thus, after billions of years, the only code existing is the one that produces life on this planet. Supposing we did all come from the primordial soup, don't you think different types of DNA, those coding for blobs of goo (conglomerates of protein without structure) and those that coded for useful proteins would be abundant? The DNA we have isn't the only type of DNA to exist, past or present.