But that's not the goal. The goal was to determine if any of the steps from essentially primordial sludge to simple self-replicating cells could be achieved in an environment representative of the ancient earth. Or, to put it another way, if it could happen in an experiment set up like this, it could equally happen in nature without any intelligent input. That is the purpose of the experiment.
The M-U experiments were also a look back at an old idea called "vitalsim":
"Vitalism is an obsolete scientific doctrine that "living organisms are fundamentally different from non-living entities because they contain some non-physical element or are governed by different principles than are inanimate things".
https://www.google.com/?gws_rd=ssl#q=vitalism
What they wanted to know is if the production of amino acids required life, if amino acids were fundamentally different from what abiotic processes could produce. They found that biochemistry can be produced through abiotic means which was one of the first steps in showing how life could emerge in the absence of life.
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