Before: a chemical soup.
Now: chemical soup
Now: chemical soup
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Before: a chemical soup.
Now: chemical soup
Contaminated with LIFE!
Who's to say that it isn't and then being destroyed by chemistry or life?
Almost there...
Ach I'm not being fair, as you're a good sport here's the answer.
Life has altered the Earth's chemical conditions which in turn has suppressed the spontaneous formation of new DNA molecules.
On Earth life itself prevents spontaneous life generation through being a contaminant, natural selection is therefore limited to only one existing type of DNA molecule, this has a major advantage and a major drawback...
FYI photosynthesis and oxygen is not a product of life. Or proof of evolution. Oxygen is a deadly noxious corrosive gas and it is impossible for life forms "evolved" to breathe any other gas to adapt to its existence. Oxygen would have been the equivalent of highly succesful total anhilation to all non-oxygen breathing organisms - as it still is today. Anaerobic bacteria can only live in the absence of oxygen.
That cartoon beer good posted was pretty funny.