DNA lesions cause cell killing and mutations if they are not adequately repaired. Exposure of cells to UV light radiation results in formation of the two most common lesions, the cyclobutane pyrimidine dimer (CPD)1 and the 6-4 pyrimidine-pyrimidone photoproduct (6-4PP) at adjacent pyrimidines (1). These lesions inhibit DNA replication and transcription and are normally removed from the genome by nucleotide excision repair (NER) in most organisms, including humans (2). By contrast to a cis-syn CPD, which has only a modest effect on the DNA structure, a 6-4PP induces a large structural distortion and is repaired more rapidly than a CPD by NER

And that says totally opposite of what youre saying Pony. Besides, can it be true that these single celled organisms couldve respired enough to make an Ozone layer after they arose from the primordial soup? I aint buying it. Agree to disagree I guess.

And once again, agree to disagree on the Thermodynamics. Even since the Earth isnt a closed system, the energy being put in is gonna cause more harm than good in Abiogenisis.

Evolution really isnt based on observations, but meer assumptions and "would if's" to explain an otherwise basisless theory. Have we ever seen abiogenisis? Nope. Have we ever performed abiogenis in suitable conditions for life, let alone in this primordial soup? Not yet. Til we do so, its basisless, and even then, its still never occured in nature.

Heres another quote on the early atmosphere:

The atmospheric conditions proposed by Oparin, Haldane and Urey were radically different from what exists today. Because oxygen destroys the chemical building blocks of life, they speculated that the early earth had an oxygen-free atmosphere. However, in the last few decades, evidence has surfaced that has convinced most atmospheric scientists that the early atmosphere contained abundant oxygen. In the 1970’s Apollo 16 astronauts discovered that water is broken down into oxygen and hydrogen gas in the upper atmosphere when it is bombarded by ultraviolet radiation. This process, called photo dissociation, is an efficient process which would have resulted in the production of large quantities of oxygen in a relatively short time. Studies by the astronauts revealed that this process is probably a major source of oxygen in our current atmosphere.The assumption of an oxygen-free atmosphere has also been rejected on theoretical grounds. The ozone layer around planet earth consists of a thin but critical blanket of oxygen gas in the upper atmosphere. This layer of oxygen gas blocks deadly levels of ultraviolet radiation from the sun. Without oxygen in the early atmosphere, there could have been no ozone layer over the early earth. Without an ozone layer, all life on the surface of planet earth would face certain death from exposure to intense ultraviolet radiation. Furthermore, the chemical building blocks of proteins, RNA and DNA, would be quickly annihilated because ultraviolet radiation destroys their chemical bonds. It doesn’t matter if these newly formed building blocks are in the atmosphere, on dry ground, or under water.

So evolutionists have a major dilemma. The chemical building blocks of life would be destroyed if oxygen was present, and they would be destroyed if it wasn’t! This "catch 22" has been noted by evolutionist and molecular biologist Michael Denton: "What we have then is a sort of ‘Catch 22’ situation. If we have oxygen we have no organic compounds, but if we don’t we have none either." Even if the building blocks of life could survive the effects of intense ultraviolet radiation and form life spontaneously, the survival of any subsequent life forms would be impossible in the presence of such heavy ultraviolet light. Ozone must be present to protect any surface life from the deadly effects of ultraviolet radiation from the sun.

Finally, the assumption that there was no oxygen in the early atmosphere is not borne out by the geologic evidence. Geologists have discovered evidence of abundant oxygen content in the oldest known rocks on earth. Again, Michael Denton: "Ominously, for believers in the traditional organic soup scenario, there is no clear geochemical evidence to exclude the possibility that oxygen was present in the Earth’s atmosphere soon after the formation of its crust."

All of this evidence supports the fact that there was abundant oxygen on the early earth. However, with or without oxygen, evolution is in a no-win situation. Spontaneous generation could not have occurred either with oxygen—or without it!