65
   

Don't tell me there's no proof for evolution

 
 
Wolf ODonnell
 
  1  
Reply Fri 26 Oct, 2007 03:20 am
real life wrote:
A new phylum requires MAJOR development (example: totally new body plan), species and genus don't.


Which the time period given allows for. Yes, as a percentage of the entire Earth's history, it's small, but when you count it in years, it's several times longer than the age given to the Earth by James Ussher and more than adequate enough to develop a new phylum.


Quote:
For new phyla to show up suddenly in the fossil record without transition is a slap in the face to the evolutionary concept.


No, it's not. See Farmerman's response.

Quote:
New species with slight differences between it and the previous species by definition would say that there was an identifiable transition.

Quote:
Described recently as "the most important evolutionary event during the entire history of the Metazoa," the Cambrian explosion established virtually all the major animal body forms -- Bauplane or phyla -- that would exist thereafter, including many that were 'weeded out' and became extinct. Compared with the 30 or so extant phyla, some people estimate that the Cambrian explosion may have generated as many as 100. The evolutionary innovation of the Precambrian/Cambrian boundary had clearly been extremely broad: "unprecedented and unsurpassed," as James Valentine of the University of California, Santa Barbara, recently put it (Lewin, 1988).

Lewin then asked the all important question:

"Why, in subsequent periods of great evolutionary activity when countless species, genera, and families arose, have there been no new animal body plans produced, no new phyla?"

Lewin, R. (1988)
Science, vol. 241, 15 July, p. 291


I'm very curious. Where did you get that? Science is notorious for being expensive. The average laymen can't get access to it without shelling out a minimum of $15 per article and certainly, I can't do it without checking that you haven't misquoted him.

Also, what part of, the fossil record is imperfect do you not understand? Evolution still explains everything else, does it not? How have you proved it wrong?

And whether an advanced phylum exists before a less advanced one is besides the point. Firstly, prove it. Secondly, even if one does, so what? Are you saying an advanced phylum can't be wiped out by natural selection pressures? How naive of you.

P.S. I forgot to mention that we have now 18 fossils of pre-Cambrian chordates, which kinda proves your statement wrong. It is telling that you don't really use any recent scientific articles.
0 Replies
 
farmerman
 
  1  
Reply Fri 26 Oct, 2007 06:11 am
That article of RL's demonstrates the problems with announcing things and then sticking with it. AYALA (1998) has stated that from the divergence studies based upon DNA from modern counterparts, the spliting of Chordates and Echinoderms occured more like 670 to 690 my ago (In the newly named Ediacaran period)
Quote:
"Its hard to escape the suspicion that what we witness in the CAmbrian is mostly a tinkering with developmental systems already firmly established by the time Cambrian beasts showed up"...
(N.C. Hughes 2000)

Another problem with RL's quote is its incorrect factually, since Bryozoa apparently didnt make their apperance until the Ordovician some 75 my later.

So, from the Ediacara we have the first chordates (giving rise to the vertebrates and all the "advanced" things) appearing before the bryozoans, one of the least advanced (called "moss animals") . AN example of environmental opportunism , since the sources of the bryozoans seem to parallel the nice thick deposits of limestones, indicating an environment unique to this phylums needs.

Gould (2002) predicted that chordates would have diverged (according to the fossis of the Flinder Range) somehwere between 5 and 10 my in the Late preCambrian. Newest fossil finds (the ranges of those specimens Wolf mentioned) now lean us toward a split off that occured in about a 5 my period


I would think, were I a Creationist , subject to the limitations of that disciplines educational requirements. Id go find out how LONG was a pre CAmbrian day and year, so that maybe these dates we throw around caould be compress (Biblically) even further and would present a problem in our stratigraphic ages. Not that I wanna do your homework for you RL, but sometimes you miss the big things.
0 Replies
 
farmerman
 
  1  
Reply Fri 26 Oct, 2007 06:24 am
Quote:
"Why, in subsequent periods of great evolutionary activity when countless species, genera, and families arose, have there been no new animal body plans produced, no new phyla?"

Lewin, R. (1988)
Science, vol. 241, 15 July, p. 291


This is a correct quote from Sci, Theres been some stuff redacted and its not that Lewin was surprised by making this statement. It is a bit "out of context" but when we look at the date (almost 20 years old) a lotr had happened in the 90's and the 2000's. We always knew that Bryozoans came after all the other phyla and had suspected (since the Burgess) that chordates were actually quite early.

RL wants to post it as if to make it sound that theres confusion among scientists who work this area. Theres not.


And even if it were a statement that warrants bumper stickers, SO WHAT?. Pining away for new phyla is just some taxonomists wet dream. Evolutionary biology and paleo couldnt give a rats ass whether or not there werent any new phyla. Theyre having a ball tracing how present day life evidences its long evolutionary ride. Maybe Lewin was decrying a fact that hed run out of work? :wink:
0 Replies
 
wandeljw
 
  1  
Reply Fri 26 Oct, 2007 09:33 am
The New York Times reports that a chemistry professor has retracted an old paper he wrote after he found out it was being cited on creationist websites.

Quote:
0 Replies
 
cicerone imposter
 
  1  
Reply Fri 26 Oct, 2007 10:09 am
They key paragraph that separates science from religion: It is not unusual for scientists to publish papers and, if they discover evidence that challenges them, to announce they were wrong. The idea that all scientific knowledge is provisional, able to be challenged and overturned, is one thing that separates matters of science from matters of faith.
0 Replies
 
real life
 
  1  
Reply Fri 26 Oct, 2007 10:17 am
wandeljw wrote:
The New York Times reports that a chemistry professor has retracted an old paper he wrote after he found out it was being cited on creationist websites.

Quote:
........In it, Dr. Jacobson speculated on the chemical qualities of earth in Hadean time, billions of years ago when the planet was beginning to cool down to the point where, as Dr. Jacobson put it, "one could imagine a few hardy compounds could survive."..........

............Another creationist site, Evolution-facts.org, says his findings mean that "within a few minutes, all the various parts of the living organism had to make themselves out of sloshing water," an impossible feat without a supernatural hand.

"Ouch," Dr. Jacobson said. "It was hideous."...........


Retraction or no, this objection to abiogenesis is valid.

Sweeping it under the rug won't help. One would think a 'scientist' would be valiant for the truth, wherever it leads.

I thought scientists welcomed challenges to be the catalyst in either maintaining OR changing the orthodoxy.

Apparently only defense of the orthodoxy is acceptable to Dr Jacobson now. Shows what happens after years of indoctrination take their toll. He was much braver when he was young.

The unlikely prospect of life putting itself together in the 'early history' of the Earth is a barrier that the hardiest anti-creationists have yet to make progress overcoming.

Any supposed pre-biotic compounds, amino acids, proteins, xNA, etc that one imagines would have likely have been soon destroyed by the very environment that supposedly generated them.
0 Replies
 
farmerman
 
  1  
Reply Fri 26 Oct, 2007 11:11 am
Quote:
Retraction or no, this objection to abiogenesis is valid
In the ensuing 50 years since he published that, abiogenesis has gained an even stronger foothold in biochemistry.
Quote:
Any supposed pre-biotic compounds, amino acids, proteins, xNA, etc that one imagines would have likely have been soon destroyed by the very environment that supposedly generated them
And your vast research experience leads you to this conclusion how?
0 Replies
 
real life
 
  1  
Reply Fri 26 Oct, 2007 11:40 am
farmerman wrote:
Quote:
Retraction or no, this objection to abiogenesis is valid
In the ensuing 50 years since he published that, abiogenesis has gained an even stronger foothold in biochemistry.
Quote:
Any supposed pre-biotic compounds, amino acids, proteins, xNA, etc that one imagines would have likely have been soon destroyed by the very environment that supposedly generated them
And your vast research experience leads you to this conclusion how?


Hmm. Perhaps I'm wrong.

What do you think happens to protein or DNA left in the open environment, farmerman?
0 Replies
 
maporsche
 
  1  
Reply Fri 26 Oct, 2007 12:19 pm
real life wrote:
farmerman wrote:
Quote:
Retraction or no, this objection to abiogenesis is valid
In the ensuing 50 years since he published that, abiogenesis has gained an even stronger foothold in biochemistry.
Quote:
Any supposed pre-biotic compounds, amino acids, proteins, xNA, etc that one imagines would have likely have been soon destroyed by the very environment that supposedly generated them
And your vast research experience leads you to this conclusion how?


Hmm. Perhaps I'm wrong.

What do you think happens to protein or DNA left in the open environment, farmerman?


Aren't we talking about precursors to today's protein and DNA? Is it possible that DNA wasn't always so fragile?

I'm not proposing that this is the case here, but just something that crossed my mind.
0 Replies
 
maporsche
 
  1  
Reply Fri 26 Oct, 2007 12:19 pm
real life wrote:
farmerman wrote:
Quote:
Retraction or no, this objection to abiogenesis is valid
In the ensuing 50 years since he published that, abiogenesis has gained an even stronger foothold in biochemistry.
Quote:
Any supposed pre-biotic compounds, amino acids, proteins, xNA, etc that one imagines would have likely have been soon destroyed by the very environment that supposedly generated them
And your vast research experience leads you to this conclusion how?


Hmm. Perhaps I'm wrong.

What do you think happens to protein or DNA left in the open environment, farmerman?


Aren't we talking about precursors to today's protein and DNA? Is it possible that DNA wasn't always so fragile?

I'm not proposing that this is the case here, but just something that crossed my mind.
0 Replies
 
Joe Nation
 
  1  
Reply Fri 26 Oct, 2007 01:59 pm
RL always makes it sound as if there was one little DNA strand or one little amino acid floating about instead of thinking about the trillions that were possible.

Joe(only the what survive?)Nation
0 Replies
 
cicerone imposter
 
  1  
Reply Fri 26 Oct, 2007 02:44 pm
Joe(it's the "it")Nation, according to rl.
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real life
 
  1  
Reply Fri 26 Oct, 2007 03:08 pm
Joe Nation wrote:
RL always makes it sound as if there was one little DNA strand or one little amino acid floating about instead of thinking about the trillions that were possible.

Joe(only the what survive?)Nation


Considering the difficulty Miller and Urey had trying to generate things on purpose, you need to show why you think trillions of them are realistically possible due to chance.
0 Replies
 
farmerman
 
  1  
Reply Fri 26 Oct, 2007 04:06 pm
Its ,more likely that RNA and DNA didnt occur until life was already established,theres evidence that even these compounds "evolved" (consider GNA). Theres nothing in the rulebooks that says that DNA is where it started.

Life has to have the motile and robust cell wall so that it can act as a shield against a physical and chemical gradient thats always trying to tear it apart.
Life is growth, reproduction, tropisms, etc. The condition that RL wants us to think is going on was caused some divine thumb starting it all and then what? If a god created everything in its present form, why do we even have evidence of extremely simple life forms in the VEndean and deep PreCambrian? What purpose , if not to serve as precursors.

We may never know, or we may stumble over it, but goodness sakes, lets at least keep our minds open to novel and elegant solutions withhout defaulting to the Poofster.
0 Replies
 
rosborne979
 
  1  
Reply Fri 26 Oct, 2007 04:07 pm
real life wrote:
Any supposed pre-biotic compounds, amino acids, proteins, xNA, etc that one imagines would have likely have been soon destroyed by the very environment that supposedly generated them
Farmerman wrote:
And your vast research experience leads you to this conclusion how?

Hmm. Perhaps I'm wrong.

What do you think happens to protein or DNA left in the open environment, farmerman?

How come you only ask Farmerman about Protein or DNA, when in your original quote you said, "ANY supposed pre-biotic compounds", and you also mentioned amino acids, which we know are found to occur naturally.

That's very tricky, first you make a sweeping statement that indicts ALL pre-biotic compounds as being impossible in their environment. But when challenged on the statement as a whole, you respond by picking two specific items (neither of which anybody claims arose without precursors), and implying that if they couldn't arise, then nothing could arise.

That's pretty pitiful defense of your original quote. Not only is it an insufficient defense, but it's also deceitful in its presentation. Typical of you.
0 Replies
 
maporsche
 
  1  
Reply Fri 26 Oct, 2007 04:14 pm
And Real Lie wonders why we call him a liar.
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username
 
  1  
Reply Fri 26 Oct, 2007 11:44 pm
SPACE, THE FINAL FRONTIER

Poor rl, he just can't catch a break. After his latest attempt at denigration, claiming complex molecules couldn't continue to exist on the early earth, turns out complex organic molecules, the basic building blocks of life, are almost literally everywhere, and they survive in probably the most rigorous environment of all--space. Stars spew
'em out in huge quantities. Don't even need an atmosphere, rl. It's beginning to look like you're gonna get life whether you want it or not.

http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=12846
0 Replies
 
farmerman
 
  1  
Reply Sat 27 Oct, 2007 05:25 am
Theyve identified about 6 of the 20 proteins (associated with our carbon base life) in spectra from stars and I think 2 of the earth 's important nucleotides. (In space spectra theyve also found organic molecules that we dont include in our bio makeup, but whose to say that some other carbon based life system cant exist being based on a SIlane or SIloxane tetrahedron.
Ive always been a fan of Silicon based life since the silicon /oxygen crystal lattice can transmit information directly around the block. Silicon based life could be HUGE.
0 Replies
 
Joe Nation
 
  1  
Reply Sat 27 Oct, 2007 05:32 am
real life wrote:
Joe Nation wrote:
RL always makes it sound as if there was one little DNA strand or one little amino acid floating about instead of thinking about the trillions that were possible.

Joe(only the what survive?)Nation


Considering the difficulty Miller and Urey had trying to generate things on purpose, you need to show why you think trillions of them are realistically possible due to chance.


Even Joanie Mitchell knew the answer to that in 1969... .

Joe(we are stardust)Nation
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Wolf ODonnell
 
  1  
Reply Sat 27 Oct, 2007 05:34 am
real life wrote:
Retraction or no, this objection to abiogenesis is valid.


Except hm... what was this? Jacobson said that his objections to abiogenesis weren't objections and that they were based on false assumptions anyway.

I personally didn't post the article here, because I knew you'd take it out of context, ignoring the part where Jacobson said it was wrong and contained errors.
0 Replies
 
 

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