Most evolutionists hinge on some belief about shared ancestry. This DOES NOT prove evolution. It's backwards. There is NO evidence for a working, functional evolution. And, in fact, all of the "evidence" for common ancestry can be attributed to common Design elements. If you can't solve the problem going forward, to where it actually becomes useful, and real, then you believe in a new age fairy tale, taken all together. A false religion of so-called science that is a DILLUSION. Fate is not without a sense of irony, I suppose. The Bible has always made the same claim about what it is, and where it comes from, and still stands firm on testable, repeatable, observable scientific phenomena.
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There is no "striving". There is make a copy or do not.
How did life startup? We don't really know yet. We know if could not have used DNA yet because that requires compilers and parts that could not spontaneously emerge.
But - RNA - can self assemble and can catalyze reactions like a protein. The first replicators were probably just simple chemistry loops - probably in clay crystals near geothermal vents. As the energy gradient went from the heat of the vent to the cold of the ocean - loops of chemical reactions took place.
We already know from studies of comet tails that some amino acids will self assemble in non-life contexts. There are a lot of things like the chirality (the "handedness" ) of amino acids vs sugars would have been an early selective sieve. That might be built into the universe itself - ultraviolet may have a higher likelihood of breaking apart the ratios so they were not 50:50.
But in any case - billions of years of simple chemistry predated anything like replicators. None of that leaves much evidence we can get at - but maybe by looking at Mars or comets - we might get some clues.
But the process that started things off would have been one where the only things that emerged from this were things that could replicate. Those simple replicators would have evolved from non-random selection of random variations in niches across the planet. Once you have one instance that replicates and makes a successful copy - the rest is just inevitable.
Im not into that urey Miller bs. Sorry. Is that what its called?