T
Texas_Roofer
Guest
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In answer to a question about the need for oxygen, Alec responded: “Most animals, whether land or marine, need oxygen. While it is consistent with a common ancestor, it is not particularly strong evidence for it.” (post 64)
From my point of view, the need for oxygen goes back to a common source of building blocks or whatever the scientific name is for the first gathering of components which are life. I am operating on the principle that the evolutionary theory does not explain the source or the “creating origin” of life itself. So, at this point, I am not addressing the theistic or non-theistic original origin of life. I am looking for the lowest common denominator of life.
Well, the need for oxygen isn’t it, because there was a time when the earth’s atmosphere contained little or no oxygen. The oxygen in the earth’s atmosphere was produced by photosynthesising bacteria (known as cyanobacteria), or by methanogens something over 2 billion years ago. The need for oxygen found in most animals is not therefore fundamental to life.
Actually, if you’d asked me the question about lowest common denominator rather than about oxygen use I might have been able to be more helpful. In my view, it is the fact that all life uses the same DNA molecule (consisting of nucleotides arranged on a double helix with a sugar phosphate backbone, ten per right hand turn, and containing sequences of the same four nucleotides), and the same twenty amino acids (even though others could potentially be used) in only their left handed, and not their right handed configuration (even though the exist in a right handed form). There are some very basic things which differ between major domains of life (the archaea, bacteria and eukaryotes) but are common within the domains such as the tRNA to protein translation machinery called ribosomes. But the DNA itself and the amino acids are common across all domains.
Amazing simply amazing, what a lack of scientific understanding. Just as our ancestors could not have had access to this information our posterity will surely dismiss this. There is nothing wrong with understanding current theory (known as hypothesis) however to assume it cannot be advanced (specifically until you personally advance it) is to misunderstand the fundamentals of science.