{"text":"Life on earth evolved gradually beginning with one primitive life form – perhaps a self-replicating molecule – that lived more than 3.5 billion years ago; it then branched out over time, throwing off many new and diverse species; and the mechanism for most (but not all) of evolutionary change is natural selection. ","author":"Jerry A. Coyne","tags":["evolution","natural-selection"],"id":4604,"author_id":"Jerry+A.+Coyne"}