Given the many layers of microscopic, sub-cellular, pre-cellular, symbiotic carbon based organic components that make up our complex living bodies it comes as no surprise to me that one of those earlier sub-cellular life forms would be RNA, which may have begun as it's own independent pre-cellular entities, and that a competitive pre-cellular entity in the form of DNA merged with it and enslaved it. Whether both entities evolved naturally on this planet from a common ancestor, or they were transported here from another world via ice in an interstellar body like a comet, the laws of nature on this side of the sun seem to be eat or be eaten, absorb or be absorbed, enslave or become enslaved. If you look at the sub-cellular components that are housed within the smallest structures of cells and organisms it is clear that each of these organic components has a single job to do that when combined with one another form a functioning mechanism. But this doesn't mean that they began that way. I am convinced that prior to becoming the different parts of cells, each of these components was it's own independent entity, possibly alive or possibly just a mechanism, or maybe something in between, the way a virus is in between both a living thing and a non-living thing. And maybe like a virus, which is not really alive until it enters a living host, and then the virus "steals" some of that host's life in order to animate itself and reproduce... maybe these early pre-cellular mechanisms merged symbiotically into more complex mechanism where each entity became specialized... until finally there were so many different mechanisms with specific specialized functions that they simply formed a shell-like membrane to protect their interior and Viola, the first living cells were formed. And somewhere in there the entity DNA simply "hired" the entity RNA to work for it - by enslaving it to the natural will of the DNA to succeed and dominate its cell. The DNA clearly was like the brain of the cell, and maybe even the controlling and organizing force behind the pre-cellular mechanisms that worked with it and eventually for it. Who knows the battles that went on between the DNA and RNA entities for control over their supporting mechanisms: and DNA won - at least so far. but a least we can follow the path of the pattern, where now the individual cells joined together to form larger organisms, and so on, with each new incarnation enslaving the cells of the previous life forms to make larger and more complex beings: with hearts, livers, bloos, bones, and brains -each collection of cells forming organs that were enslaved to bodies that were controlled by brains. And behind it all, the master slave-maker; DNA.