nolidad said:
So if archy was a transitional what is it a transition of ? can't be true birds-many were around when archy was on the scene? Dead end?
Side branch, dead end. Very likely. But like the true bird branch it stemmed from a dinosaurian ancestor and broke from the true bird line after the latter diverged from its dinosaurian ancestor. IOW, archy did not diverge directly from dinosaurs, but from the same early dino/bird transitional ancestor from which true birds evolved.
so we have a unique bird in the avian family. I wonder what would have been said of penguins oif no feather remains were found?? I wonder if they would class it as a seal cousin with a bill??
Every species is unique in some way. That is how the species is identified. The penguin would be identified as a bird. It does not have mammalian characteristics.
With no dna sampling! amazing!! morphology has a lot of merit but cannot be conclusive and morphology is the only thing they class it on.
Are you suggesting that morphological change is not a proxy for genetic change? Can you describe a mechanism for morphological change that approximates it more closely than genetic change does?
Despite the 95% genetic identicalness of things birds have their own unique DNA from therapoda and reptiles and we can never disprove peoples "opinion" of archy cause we have no DNA to show one way or the other. All we have is a true flighted bird with different but not unique features found in the avian world (with the exception of a jaw and full tail bone)
Sorry, I don't follow this. I have no idea what you are trying to say here.
Or unless you can demonstrate that what is termed micro evolutoin produces the changes that evolutoinary theory says happens- it really doesn't make it inevitable.
Start a rock rolling down a steep hill. Unless it is blocked by something, it will inevitably roll to the bottom. Evolution is like that. You want to show that it is not, you need to show what blocks it.
What we have observed and tested and proved is that "micro evolution" does produce change in a species but it is variation within the species and genus and has never been observed to produce new genera.
Speciation never produces a new genus. What we call genera are classifications made after the fact which attempt to group species that are closely related. And then we make after the fact classifications of genera into related families. And so on through the higher taxa. All the higher taxa are human-defined on the basis of shared derived synapomorphies. Only species have a natural as well as a human definition in the reproductive barrier between species.
Thej field mouse went through some "micorevolutionary" changes but it still remains a field mouse, just a new sub species fo trhe original species.
If it were just a sub-species it could still interbreed with the other field mice, just as different breeds of dogs can. That it doesn't, even when given opportunity to do so, shows that it is a true new species.
Remember the termsw, "suggest" appears" could be" "seems to suggest" "concludes us to believe" are not scientific facts but opinion based on personal bias.
No, they are opinions based on evidence. Since science generally deals in probabilities, not absolutes, the typical science paper is filled with the language of possibilities and probabilities. Doesn't mean that they doubt their evidence or their conclusions.
Somewhere at some point you had to have a creature that at one stage had a exverted sternum and then at some point it had to change to inverted as birds have.
Yes, and maybe one day we will find a fossil with one or more of those features. I think one of the most amazing reports I read recently was of a fossil whose nostrils were found among its teeth.
Kenichthys has a back nostril that is located right on the lip, separating the two-toothed upper jawbones, the maxillan and the premaxillan. (It is as if we were to have a nostril in a gap between our front teeth and our canine teeth.) In other words, it constitutes a perfect halfway point in the nostrils migration from the face to the palate, and moreover this halfway point is the precisely the one that some scientists have regarded as an anatomical impossibility. Unfortunately the cord of nerves and blood vessels has not been preserved in Kenichthys, but since it normally runs from the maxillan to the premaxillan, it must either have been cut off or relegated to another position. What was considered impossible was apparently possible after all.
http://arstechnica.com/articles/columns/science/science-20041107.ars/2
And the evidence to "prove" this concept is?? Was Peter Jennings ther to report on it? Nice concept but impossible to test.
Not impossible at all. It's been observed in nature and replicated in the laboratory. If you checked out some sites on observed speciation, you likely ran across this experiment.
1. G Kilias, SN Alahiotis, and M Pelecanos. A multifactorial genetic investigation of speciation theory using drosophila melanogaster Evolution 34:730-737, 1980.
New species of
Drosophila were generated over five years by placing
Drosophila melanogaster populations in environments of differing temperature with differing food sources.
Okay so give me the preponderance of evidence for these qoutes of yours:
b) reproduction rates that outstrip available resources resulting in a competition for resources and/or changing environmental systems which require different adaptations e.g. to new food sources.
But I thought first of all you said enviornmental conditons do not cause mutrations--now you say they do. But show the enviornmental conditons that forced therapods over the unknown millenia to undergo the changes to birds.
For the first part (reproduction rates that outstrip available resources) read Malthus. And consider why
we worry today about the global population explosion.
And no, I am not saying that environmental conditions cause mutations. (Sometimes they do: radiation causes mutations.)
Just because a new environment requires adaptation does not mean the mutations necessary to adaptation will occur. Species are just as likely--no, more likely--to go extinct than to adapt. However,
if adaptive mutations occur, they will assist the species to survive in the new environment.
That this does happen is shown again by observation, as in the
Drosophila experiment above.
btw, I don't know why a creationist would dispute that species adapt to new environments. Its very much part of creationist scenarios of how bio-diversity develops.
c) differential reproductive rates which favour the better exploitation of the current environment and/or better adaptation to a changed environment.
Best source I know of for lots of examples of this (and not just in finches) is
The Beak of the Finch by Jonathan Weiner.
after you have shown the rapid alteration of the enviornment
I didn't say the environmental change was rapid. Some are, some aren't. You don't necessarily need a big environmental change. A species can encounter a new environment by migration.
So do you also say that there was a constant altering of enviornmental conditons that we do not see today ?
We are seeing it today. We are making it happen today through destruction of species habitat. We are losing more species per week than we used to lose per 3 centuries. And the rapid rate of global warming is making it even worse.
Remember punctuated equilibria still calls for many millenia of enviormental upheaval.
No, it doesn't. It only calls for a small sub-population to be isolated from the main body of the species. Since new genes can be fixed more quickly in a small population than in a large one, the isolated population evolves more rapidly than its parent and diverges from it in a relatively short geological time-frame.
There are many ways the isolation of such a sub-population can occur without invoking environmental upheaval. Of course, environmental upheaval creates many opportunities in which a punctuated equilibrium scenario can occur, but it is not a necessary pre-condition.
Well then are you saying that God ordered and watched over and interceded with every step of evolution??
I would say it is a definite possibility. I can't logically rule it out.
Then download the info--they showed the changes and the conditions which produce the changes.
Better if someone who has a better grasp on physics does it. I'll wait for shernren's comments.
Well the ascent from ape to man is laughable and you should agree. partial skulls , fossils gatherd hundreds of yards apart form each other (Java Man) do not an ascent make.
I don't find it laughable. As far as I can see, paleontologists and biologists have made a sound case. As for parts of a fossil being found in a scattered condition, why would that be startling? I expect the report showed why it was concluded they came from the same individual.
But with pigeons and buffaloes we have recorded history. With the supposed transitions from ape to man we have just bits and pieces
Indeed without the historical record we could not know how abundant those species once were. So why do we have all those bits and pieces of very ancient human skeletons but none to show of the pigeons and buffalo of such a recent past? You would think for every partial skull of a hominid fossil, one would find a thousand passenger pigeon skeletons from just a century ago. Why don't we?
We see mutation, we see speciation (which is a rare occurence in nature relatively speaking in terms of repro rates) but we do not see the higher taxa changed.
By definition, since we have seen mutation and speciation, we have seen evolution. And we have seen the higher taxa changed as well. Birds are now grouped inside the clade of dinosaurs. The cetaceans are now placed within the arteriodactyla next to the hippos. In fact the containing group is now called the cetarteriodactya.
We have all sorts of enviornmental conditions occuring putting all sorts of pressure ojn all sorts of species-- what we do see is extinction and diminished population, not mutation causing new species to flouish in the hostile enviornments
Yes, we are living out what Paul describes in Romans. We were supposed to exercise a loving dominion over our fellow creatures and to care for the garden earth God gave us. Instead we have turned it into a dying ground for them, and potentially for us as well. For this alone, even apart from what we do to each other, for this destruction of God's good creation, we deserve God's wrath-filled judgment.
But not conclusive in and of itself.
That is why I called it a "key piece of evidence", not "conclusive proof".
Unless you wish to say we are just a different kind of ape.
In fact, (except for the demeaning adjective "just") that is exactly what we are. A different and very special kind of ape.
Other than bacteria wherte has this been shown?
I think it has been studied only in bacteria. However, given the rapid radiations of species we see in the fossil record, I wouldn't be surprised if it occurs in more complex species too.
Yeah but show that it creates a new species that is the basic argument. We need to see a mutation causing a homo spaien to become a homo ??????
Most cases of speciation require many more than one mutation.
Here is a recent study on the development of the human nervous system which concludes that it took thousands of changes in many genes since our divergence from chimpanzees to develop this system alone.
http://www.ncbi.nlm.nih.gov/entrez/..._uids=15620360&query_hl=7&itool=pubmed_docsum
No the phylogeny is based on morphology and the appearance of similarities and differences in fossil evidence.
Morphology is concrete evidence. And phylogeny is not just a matter of similarities and differences. It is a pattern of similarities and differences. The pattern is more important than the similarities and differences themselves. Common descent is the only mechanism we know of that produces the pattern of nested hierarchy which scientists were familiar with even before Darwin was born.
That genetic analysis leads to not just to a nested hierarchy, but to basically the same nested hierarchy is powerful evidence that morphology is a proxy for genetic changes.
Well fossils are the only evidence to even propose that any evolution could have occured.
That wasn't even true in the 19th century. Most of Darwin's evidence was not based on fossils. In his recent book,
The Ancestor's Tale, Richard Dawkins asserts that the non-fossil evidence for evolution is so solid that fossils are not even needed anymore for confirmation. He also says the fossils alone would be sufficient to establish evolution. As it happens we have both.
So your second cousin is a fish?
I said more or less distantly. I think "more distantly" applies to the trout.
we are the only existing creaturet hat is in the image of God. We did not get there through mutastions over millions of years.
I agree. We are the only existing creature in the image of God. And we did not acquire the image of God through mutations. We did acquire all our other characteristics through mutations and natural selection.