My understanding is that all living things on earth contain the DNA molecule.
As Dr. Dawkins has so eloquently revealed over the course of his studies, one can trace the evolution of lifeforms back in time to shared ancestors of simpler and simpler form on the tree of life until one reaches presumably the first lifeform from which all else has evolved.
My question is this.
Was the DNA molecule as we know it today in all its complexity present entirely in that first initial lifeform but only manifesting the simplest possible attributes of its potential or was the DNA molecule itself extremely basic in form at the outset and therefore has evolved in complexity as well to its current form in present day along with the lifeforms whose blueprint it carries within it?
In other words is the DNA molecule we know today the exact same molecule containing the same potential information that started this entire process of evolving life so many years ago?