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€uromeinke, FEJ. and Ghoulish Delight RULE!!! NA abides. |
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#11 | |||
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Join Date: Aug 2006
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You would expect a designer to create the most efficient machine, to use your term, and yet, looking all arond us, life shows many examples of different forms with the same function (e.g., different structures making up the wings of birds, bats, insects, and pterodactyls; different organs for making webs in spiders, caterpillars, and web spinners; and at least eleven different types of insect ears), the same basic form with different functions (e.g., the same pattern of bones in a human hand, whale flipper, dog paw, and bat wing) and some structures and even entire organisms without apparent function (e.g., some vestigial organs, creatures living isolated in inaccessible caves and deep underground), that actually argue against design, but are explicable by evolution. Life is wasteful, and much death occurs throughout the natural world, including in humans. Overall, most organisms do not reproduce, and most fertilized zygotes die before growing much. A designed process would be expected to minimize this waste, and "sin" doesn't explain the death of innocents, like animals or the unborn, or destruction in nature outside of life, like supernovae and black holes. And that's just it -- Life is nasty -- you don't explain why there is so much chaos in the universe versus order, why there is so much darkness instead of light, why there is so much coldness instead of warmth, and why so much "bad stuff", like the above, in design. We have to consider the bad design with the good design, and the inefficient with the efficient, if you want to conclude a designer. Quote:
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But, to veer off evolution for a second, and speak about abiogenesis, I personally feel, as most in science do now, that the "puddle of ooze" theory you mention, which was popular in the 1950s, is almost certainly not entirely correct. One of the best theories, which has been around for over 30 years, and uses crystals, such as quartz, which were around in abundance in the early years of Earth's formation, and, as I mentioned above, because crystals form, grow, break off, and the new portion also grows, they, like life, "replicate". Complex molecules on a crystal substance could then "replicate" without even having to "do anything", or having developed the means to replicate genetically yet. But there are other theories as well: * Panspermia, which says life came from someplace other than earth. The findings of life in meteorites from Mars, for example, might explain how life got to Earth, but admittedly, this theory, however, does not answer how the first life arose. * Proteinoid microspheres: This theory gives a plausible account of how some replicating structures, which might well be called alive, could have arisen. Its main difficulty is explaining how modern cells arose from the microspheres. * Clay crystals: This says that the first replicators were crystals in clay. Though they do not have a metabolism or respond to the environment, these crystals carry information and reproduce. This is similar to the preferred theory I outlined above. * Emerging hypercycles: This proposes a gradual origin of the first life, roughly in the following stages: (1) a primordial soup of simple organic compounds. This seems to be almost inevitable; (2) nucleoproteins, somewhat like modern tRNA or peptide nucleic acid, and semicatalytic; (3) hypercycles, or pockets of primitive biochemical pathways that include some approximate self-replication; (4) cellular hypercycles, in which more complex hypercycles are enclosed in a primitive membrane; (5) first simple cell. Complexity theory suggests that the self-organization is not improbable. This view of abiogenesis is the current front-runner, only because there's been so much research done in this area, which I'll get to below. * The iron-sulfur world: It has been found that all the steps for the conversion of carbon monoxide into peptides can occur at high temperature and pressure, catalyzed by iron and nickel sulfides. Such conditions exist around submarine hydrothermal vents. Iron sulfide precipitates could have served as precursors of cell walls as well as catalysts. A peptide cycle, from peptides to amino acids and back, is a prerequisite to metabolism, and such a cycle could have arisen in the iron-sulfur world. * Polymerization on sheltered organophilic surfaces: The first self-replicating molecules may have formed within tiny indentations of silica-rich surfaces so that the surrounding rock was its first cell wall. Because silicon and crystals were common in the early Earth, and because a chemical reaction occurs at the high temperatures in the ocean vents that "bonds" complex molecules to those substances, my bet is that this theory will become the front runner. Scientists believe that they have already seen life spontaneously originate from molecules in the ocean at ocean vents, but because we haven't even been visiting for 10 years, the replication part of the scientific method will have to wait a little longer. Regarding the "ooze" theory (your words), the reason that's been favored is that most of those steps can be easily replicated, except for the part of the recipe that says "wait one billion years." Because over 75% of those steps can be proven, that goes further towards proving abiogenesis occurred than just saying "don't look any further - God did it!" Amino acids, which you mentioned, and other complex molecules form everywhere, even in space. The steps required are gradual origins through the following stages: (1) a primordial collection of simple organic compounds and water. This seems to be almost inevitable, and is easily reproduced in the laboratory; (2) nucleoproteins, somewhat like peptide nucleic acid; (3) hypercycles, or pockets of primitive biochemical pathways that include some approximate self-replication; (4) cellular hypercycles, in which more complex hypercycles are enclosed in a primitive membrane, or are protected by rocks or water; and (5) first simple cell. Both chaos theory and complexity theory suggests that the self-organization is not improbable, and most research studies done favor this theory (no matter that it's not my personal favorite, the evidence seems to point this direction). Note that almost all cells around today are the product of billions of years of evolution, except simpler life forms, like viruses, that use RNA. But the earliest self-replicator was likely very much simpler than anything alive today; just looking at simpler life forms shows that self-replicating molecules need not be all that complex, and protein-building systems can also be very, very, simple, and are replicable in the lab. Again, saying "well I don't know, so therefore God did it", is not a good argument. |
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