The writers of Genesis might have been on to something, but their science-deficient brains could not imagine two ancient microscopic organisms 'getting together.' Thus the myth of Adam and Eve and all of the other hogwash therein.
Two prokaryotes got together and here we are. Not only we animals but those mutant cousins, the plants. ScienceDaily explains:
ScienceDaily (Aug. 20, 2009) — Humans might not be walking the face of the Earth were it not for the ancient fusing of two prokaryotes — tiny life forms that do not have a cellular nucleus. UCLA molecular biologist James A. Lake reports important new insights about prokaryotes and the evolution of life in the Aug. 20 advance online edition of the journal Nature.Endosymbiosis refers to a cell living within another cell. If the cells live together long enough, they will exchange genes; they merge but often keep their own cell membranes and sometimes their own genomes.
Lake has discovered the first exclusively prokaryote endosymbiosis.
And the rest, as they say, is history. In fact about 2.5 billion years. Our microscopic Adam and Eve kept on 'doing it' for billions of years and, abracadabra, here I am writing about our collective genealogy and our plant cousins, once-removed.