"Evolution is very dependent on life being present in order to evolve"

Where is the divide between chemistry and a lifeform?
As I understand it life is generally considered to have probably started from complex chemistry. This site http://www.nrao.edu/index.php/learn/science/chemistryoflife even talks about evidence of "chemical evolution"!

Not only do WE not know, I am guessing (from the request for more time) that THEY don't know themselves!