“Three billion years ago, life was then a community of cells of various kinds, sharing their genetic information so that clever chemical tricks and catalytic processes invented by one creature could be inherited by all of them.
Evolution was a communal affair.
But then, one evil day, a cell resembling a primitive bacterium happened to find itself one jump ahead of its neighbors in efficiency. That cell separated itself from the community and refused to share.
The Darwinian interlude had begun.
Now, after three billion years,
the Darwinian interlude is over.