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The proverbial "fish out of water," tetrapods were the first vertebrate animals to climb out of the sea and colonize dry (or at least swampy) land, a key evolutionary transition that occurred somewhere between 400 and 350 million years ago, during the Devonian period. Crucially, the first tetrapods descended from lobe-finned, rather than ray-finned fish, which possessed the characteristic skeletal structure that morphed into the fingers, claws, and paws of later vertebrates. Oddly enough, some of the first tetrapods had seven or eight toes on their hands and feet instead of the usual five, and thus wound up as evolutionary "dead ends."
originally posted by: Blue_Jay33
a reply to: Phantom423
Oh I understand it all to well, you just can't detect a sardonic comment.
I thought the wink at the end gave it away.
Anyways......
Listed as stage 2 of 10 of the evolutionary process, although that itself is subject to debate within the evolutionary community, but that qualifies as at least part of the "start" to me.
Tetrapods
The proverbial "fish out of water," tetrapods were the first vertebrate animals to climb out of the sea and colonize dry (or at least swampy) land, a key evolutionary transition that occurred somewhere between 400 and 350 million years ago, during the Devonian period. Crucially, the first tetrapods descended from lobe-finned, rather than ray-finned fish, which possessed the characteristic skeletal structure that morphed into the fingers, claws, and paws of later vertebrates. Oddly enough, some of the first tetrapods had seven or eight toes on their hands and feet instead of the usual five, and thus wound up as evolutionary "dead ends."
You asked for it.......
All known forms of life are based on the same fundamental biochemical organization: genetic information encoded in DNA, transcribed into RNA, through the effect of protein- and RNA-enzymes, then translated into proteins by (highly similar) ribosomes, with ATP, NADPH and others as energy sources. Analysis of small sequence differences in widely shared substances such as cytochrome c further supports universal common descent.[22] Some 23 proteins are found in all organisms, serving as enzymes carrying out core functions like DNA replication.The fact that only one such set of enzymes exists is convincing evidence of a single ancestry.[1][23] 6,331 genes common to all living animals have been identified; these may have arisen from a single common ancestor that lived 650 million years ago in the Precambrian.[9][10]
The universality of this code is generally regarded by biologists as definitive evidence in favor of universal common descent.[22] The way that codons (DNA triplets) are mapped to amino acids seems to be strongly optimised. Richard Egel argues that in particular the hydrophobic (non-polar) side-chains are well organised, suggesting that these enabled the earliest organisms to create peptides with water-repelling regions able to support the essential electron exchange (redox) reactions for energy transfer.[24]
The genetic code (the "translation table" according to which DNA information is translated into amino acids, and hence proteins) is nearly identical for all known lifeforms, from bacteria and archaea to animals and plants.
NSTA offers the following background information:
The Nature of Science and Scientific Theories Science is a method of testing natural explanations for natural objects and events. Phenomena that can be observed or measured are amenable to scientific investigation. Science also is based on the observation that the universe operates according to regularities that can be discovered and understood through scientific investigations.Explanations that are not consistent with empirical evidence or that cannot be tested empirically are not a part of science.
As a result, explanations of natural phenomena that are not derived from evidence but from myths, personal beliefs, religious values, philosophical axioms, and superstitions are not scientific. Furthermore, because science is limited to explaining natural phenomena through testing based on the use of empirical evidence, it cannot provide religious or ultimate explanations. The most important scientific explanations are called “theories.” In science a theory is a well-substantiated explanation of some aspect of the natural world that can incorporate facts, laws, inferences, and tested hypotheses (NAS 1998). Theories are powerful tools. Scientists seek to develop theories that are firmly grounded in and based upon evidence; are logically consistent with other well-established principles; have been tested in diverse settings and against diverse data; explain more than rival theories; and have the potential to lead to new knowledge. The body of scientific knowledge changes as new observations and discoveries are made. Theories and other explanations change. New theories emerge, and other theories are modified or discarded. Throughout this process, theories are formulated and tested on the basis of evidence, internal consistency, and their explanatory power.
Evolution as a Unifying Concept
Evolution in the broadest sense leads to an understanding that the natural world has a history and that cumulative change through time has occurred and continues to occur.If we look today at the galaxies, stars, the planet Earth, and the life on planet Earth, we see that the natural world today is different than in the past: galaxies, stars, planets, and life forms have evolved.
Biological evolution refers to the scientific theory that living things share ancestors from which they have diverged; it is sometimes called “descent with modification.”
Biological evolution also encompasses a range of mechanisms that cause populations to change and diverge over time, and include natural selection, migration, and genetic drift. There is abundant and consistent evidence from astronomy, physics, biochemistry, geochronology, geology, biology, anthropology, and other sciences that evolution has taken place. As such, evolution is a unifying concept for science.
The National Research Council’s Framework for K–12 Science Education recognizes that there are crucial core ideas in the sciences that “have application across all domains of science” and that should be emphasized in classrooms to “prepare students with sufficient core knowledge so that they can later acquire additional information on their own” (NRC 2012, pp. 30–31). This report concludes that “the core ideas in the life sciences culminate with the principle that evolution can explain how the diversity that is observed within species has led to the diversity of life across species through a process of descent with adaptive modification” (NRC 2012, p. 140). The Next Generation Science Standards (NGSS) is based on the Framework and also emphasizes evolution as a unifying concept because of its importance across the disciplines of science. Scientific disciplines with a historical component, such as astronomy, geology, biology, and anthropology, cannot be taught with integrity if evolution is not emphasized.
There is no longer a debate among scientists about whether evolution has and is occurring. There is debate, however, about how evolution has taken place: What are the processes and mechanisms producing change, and what has happened specifically during the history of the universe? Scientists often disagree about their explanations.
In any science, disagreements are subject to rules of evaluation.
Scientific conclusions are tested by experiment and observation, and evolution, as with any aspect of science, is continually open to and subject to experimental and observational testing.
edit on 21-7-2019 by Phantom423 because: (no reason given)edit on 21-7-2019 by Phantom423 because: (no reason given)
Scientific conclusions are tested by experiment and observation, and evolution, as with any aspect of science, is continually open to and subject to experimental and observational testing.
Scientific disciplines with a historical component, such as astronomy, geology, biology, and anthropology, cannot be taught with integrity if evolution is not emphasized......theories and other explanations change. New theories emerge, and other theories are modified or discarded.
.the real start of the evolutionary process is abiogenesis
BUT if you are intellectually honest you will understand you need them both not just to defend evolution but the total ideology being discussed. Actually for those of us that believe in creation it includes everything, it's a total concept of ideology, with many scientific titles that have little relevance to a person with faith in God.
In my discussion with evolutionists over the years they like to discuss and argue over the last box but stay far away from the first two, it's totally intellectual jiggery-pokery at it's very worst.
Abiogenesis refers to the initiation of life. Evolution refers to the development of that life. They are two entirely different sciences.
“no empirical evidence supports the hypotheses of the spontaneous appearance of life on Earth from nothing but a molecular soup, and no significant advance in scientific knowledge leads in this direction.”
originally posted by: cooperton
You don't know enough about biology then.
You don't know enough about biology to have a conversation with. Your crass attitude is also really, really obnoxious.
Science doesn't make the claim that life came about spontaneously or otherwise.
originally posted by: Blue_Jay33
a reply to: Phantom423
Science doesn't make the claim that life came about spontaneously or otherwise.
Ah now we get to your real beliefs; biogenesis...that's cool.
I also enjoy how the theory of "spontaneous generation" was just scraped when biologists realized it was impossible, yet how close is that concept within the science to abiogenesis ?
I also enjoy how the theory of "spontaneous generation" was just scraped when biologists realized it was impossible, yet how close is that concept within the science to abiogenesis
originally posted by: Phantom423
You may not know what microtubules are but they are the fundamental units which form filaments.
This lecture describes how it works:
Pay attention as to how the experiment works. If you don't understand it, look up the paper.
I don't have a clue what you're talking about - and neither do you. Biogenesis? Science NEVER said any of these things.
Biogenesis is any process by which lifeforms produce other lifeforms. For example, a spider lays eggs that become other spiders. This premise historically contrasted with the ancient belief in spontaneous generation, which held that certain inorganic substances, left alone, give rise to life (such as bacteria, mice and maggots) in a matter of days. The premise of biogenesis had been suspected long before being definitively demonstrated.