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Re: Robot Wars (Is evolutionary theory built on chance?)
Posted: Wed Nov 18, 2009 6:20 am
by touchingcloth
Gman wrote: I tend to like this definition of evolution from creationwiki as a break down.
"The word evolution basically means "gradual change". In the broadest sense the word is all-pervasive; stars, galaxies, languages, attitudes, maturity and political systems all evolve through time.
Beyond this broad definition, the word evolution is used in a number of different ways, leading to a great deal of confusion. Three major uses of the word evolution include:
• Biological evolution: the observable scientific fact that the genetic characteristics of species change over time, as a result of recombination, mutation, natural selection, and genetic drift.
• Stellar evolution: the field of astronomy that describes the theoretic changes that stars are believed to undergo during their life cycle, including star formation. Since these changes are believed to occur over millions or even billions of years, astrophysicists theorize about how stars evolve by observing numerous stars, each at a different point in its life cycle, and simulating stellar structure with computer models.
• General theory of evolution: the speculation that all life originated naturalistically without any act of creation (abiogenesis). All life on the planet is related because it originated in a single cell or population of cells (common ancestry). All the biological complexity, adaptivity, and artistry on the planet is solely the result of random changes and natural selection over millions and billions of years.
The distinction between these two uses of the word "Evolution" is important, because creationism acknowledges that biological evolution is a true and scientific reality, but argues that the theory of evolution is a speculative farce, overwhelmingly discredited by the scientific evidence."
They've butchered the definition of what is generally known as "The theory of evolution", and missed off some important major uses of the word evolution as it applies to other sciences.
I'd add
- Cosmic evolution: The shift in the cosmos over time, including inflation, expansion, emergence of the first particles, & the ratios of matter:antimatter
- Chemical evolution: The various processes by which elements are built up and broken down, most evidently in stars
I'd merge their "Biological evolution" and "General theory of evolution" into something like "Evolution of species through natural selection: the observable scientific fact that the genetic characteristics of species change over time (as a result of mutation & natural selection), that species are related to one another in a strict hierarchy, and the implication that all species share a common ancestry (be it molecular or cellular)".
If you wanted to get abiogenesis in there as a use of the word evolution, then it might fit under something like "Organic evolution: the investigation of how organic materials (amino acids, proteins, nucleotides, etc) can arise and change, with a particular emphasis on materials that are able to replicate".
Re: Robot Wars (Is evolutionary theory built on chance?)
Posted: Wed Nov 18, 2009 12:45 pm
by Gman
touchingcloth wrote:
They've butchered the definition of what is generally known as "The theory of evolution", and missed off some important major uses of the word evolution as it applies to other sciences.
I'd add
- Cosmic evolution: The shift in the cosmos over time, including inflation, expansion, emergence of the first particles, & the ratios of matter:antimatter
- Chemical evolution: The various processes by which elements are built up and broken down, most evidently in stars
I'd merge their "Biological evolution" and "General theory of evolution" into something like "Evolution of species through natural selection: the observable scientific fact that the genetic characteristics of species change over time (as a result of mutation & natural selection), that species are related to one another in a strict hierarchy, and the implication that all species share a common ancestry (be it molecular or cellular)".
If you wanted to get abiogenesis in there as a use of the word evolution, then it might fit under something like "Organic evolution: the investigation of how organic materials (amino acids, proteins, nucleotides, etc) can arise and change, with a particular emphasis on materials that are able to replicate".
Thanks TC... Yes perhaps a little more clarification is needed. I like the emphasis on "Organic Evolution" especially, but I believe that would fall under "Inorganic evolution" specifically as it relates to abiogenesis. Interestingly enough, wikipedia relates abiogenesis to chemical evolution. Perhaps that is the best fit here.
http://en.wikipedia.org/wiki/Abiogenesis
Re: Robot Wars (Is evolutionary theory built on chance?)
Posted: Wed Nov 18, 2009 2:22 pm
by touchingcloth
Gman - I went with 'organic' mainly due to the connotations of 'organic chemistry' - so molecules needed for life to prosper and perhaps arise.
Thinking about it perhaps the "organic evolution" definition could itself be split into something describing the emergence of replicating structures/molecules (structures included to mean something like crystals which, while not truly replicating, pass their form on), and the emergence of what could be called life from those self replicating substances.
Re: Robot Wars (Is evolutionary theory built on chance?)
Posted: Thu Nov 19, 2009 12:09 am
by Gman
touchingcloth wrote:Gman - I went with 'organic' mainly due to the connotations of 'organic chemistry' - so molecules needed for life to prosper and perhaps arise.
Thinking about it perhaps the "organic evolution" definition could itself be split into something describing the emergence of replicating structures/molecules (structures included to mean something like crystals which, while not truly replicating, pass their form on), and the emergence of what could be called life from those self replicating substances.
It's kind of a touchy subject. That being where does the inorganic/organic evolutionary definition begin? They seem to have separate functions if we really want to get technical.
Re: Robot Wars (Is evolutionary theory built on chance?)
Posted: Thu Nov 19, 2009 4:03 am
by touchingcloth
Gman wrote:
It's kind of a touchy subject. That being where does the inorganic/organic evolutionary definition begin? They seem to have separate functions if we really want to get technical.
Oh I agree, but they lie on a spectrum in the same way that cosmic evolution and chemical evolution do - there's a good cause to split them even if the point of the split is somewhat arbitrary.
Same goes for inorganic > organic > life - 3 quite separate things with fuzzy boundaries. I guess fuzziness is the hallmark of bilogy though, which is why zoologists get in to shouting matches over, say, which genus and species a given fossil belongs to.