Well, that was convincing. The bar is set high for evidence.
And there we are - lets wave our hands in the air and say it must be some being that operates beyond any logic. So while DNA exists in every living thing and the DNA of homo sapiens is distinct from the DNA of other living things, that makes it a "miracle" and if it is traced back to other species it is even more miraculous!
BTW: Referring to a mitochondrial eve:
1. Mitochondrial DNA is not the DNA that relates to the passing of genes that control gender or the great majority of human characteristics (Mitochondrial DNA is only associated with the energy-production organelle present in cells). It does not point to the ultimate female line - only to the female line from which that element arose.
2. This doesn't mean she was the first woman of our species, or that she lived in isolation, but rather that her
mitochondrial DNA (mtDNA) is the only mtDNA lineage that has survived and is present in all living humans today.
Similarly for the origin of the current Y chromosome in males - it points to a population in which that Y chromosome change (actually a whole series of changes as multiple genes are involved) conferred some advantage to the survival and reproductive success of those who inherited those genes such that it became common in the population. When that occurred is unlikely to be simultaneous with mtDNA appearing in human ancestry. Not that mtDNA is the ultimate female DNA line anyway.