razzelflabben said:
So if I am understanding you correctly, what you are saying is that this entire argument is occuring because neither side understands the definitions being used when discribing terms and that would equal lack of communication as I see it. Have I about covered what you are saying adequately.
As far as the ordinary adherent of TOC is concerned, that may be the case, but I expect that agreement on the terms would not lead to agreement that evolution has occurred.
For there is a reason why leaders of the creationist movement refuse to use the scientific definition of evolution. And that is an
a priori position that "evolution does not happen".
Historically we can see how creationism has changed its stance in order to avoid admitting the reality of evolution---and that is by changing from scientific terminology to a specialized creationist terminology for the same observations.
Phase one: "fixity of species" Pt. 1
Actually, as Darwin discovered, this should be listed even more narrowly as "fixity of sub-species". Darwin was a pigeon fancier, among other things, and he knew a bit about the different breeds of domesticated pigeon. And he knew other pigeon breeders. He could tell a jacobin from a fantail from a poulter, etc. Darwin came to the conclusion that all domestic breeds had descended from one wild species: the common rock pigeon.
But he found other breeders did not take kindly to this idea. You see, if Darwin was right, then breeders, not God, had "created" the different breeds of pigeons through artificial selection. The breeders were horrified by that sacreligious idea. They insisted that it was impossible for a jacobin and a fantail to have a common ancestor. They insisted that they did not "create" new breeds; they only improved the breeds which God had initially created. (Don't know what it says about their theology, to think they could improve on God's creation.)
This notion of fixity of breeds was applied, even by scientists of the day, to the human species as well, with a number of prominent scientists (e.g. Louis Agassiz) taking the position that humans of different races had each been created separately. i.e. Africans, Orientals, Amerindians, and Caucasians at least were separate original "kinds" each owing their origin to a separate creation event.
Phase two: "fixity of species" Pt. 2
Darwin's own work pretty much put the kybosh on the extreme creationism described above. For the next few decades, creationists agreed that several sub-species could have a common ancestor in the originally created species. But they still insisted that species themselves did not change and that a species could not change to the point that it became another species (or several species). In short, they insisted that each of Darwin's Galapagos finches was a separate creation, and that as a group, they did not owe their origin to a common ancestor from South America. However, by the early 20th century, it became impossible to deny the observed evidence that species do change and can be ancestors of new species. To save the assertion that evolution does not happen, creationist leaders proposed to replace "fixity of species" with "fixity of kinds".
Phase 3 "fixity of kinds"
This is still the mainstream position of creationism, and the one I was introduced to as a teenager way back in the 1950s. This position divorces the Genesis term "kind" from the scientific term "species" and agrees that several closely related species can have a common ancestor in an originally created "kind".
A corollary of this position is that humanity is an originally created kind, and not related by descent to any other kind. * (See further note on this below.)
It was also at this point that creationism began to make a distinction between micro-evolution and macro-evolution and to affirm that macro-evolution was a different process than micro-evolution. Micro-evolution, in this perspective, is the observed variation which allows a kind to diversify into several species and sub-species so that it can adapt to various environments. It is "ok" evolution. But macro-evolution demands a mechanism that allows one kind to become another kind, and that mechanism does not exist, nor is there any evidence of one kind becoming another kind. So macro-evolution, according to this theory, is "not ok" evolution and does not happen.
There is both strength and weakness in this form of creationism. Scientifically, all evolution beyond the species takes place at the point of speciation (and therefore within the "kind"), so by granting that a "kind" is a wider grouping than a species, the actual observed evolution from one species to another becomes allowable in creationism. On the other hand, this form of creationism has always been plagued by two objections. The first is the definition of "kind". If it is not a species, what is it? Creationists have always resisted attaching it to any recognized scientific category. But the groups that have been suggested as "kinds" range from a single species (
Homo sapiens) to a whole domain of many phyla (bacteria). The second objection is that from a scientific perspective there is no known mechanism which differentiates micro-evolution from macro-evolution. Scientifically, these are not seen as different processes, but as phases of the same process: within a species and beyond the level of species. Creationists have never been able to demonstrate that such a mechanism, which keeps evolution within the bounds of a kind, exists.
Phase 4: changing the vocabulary
Perhaps it became too confusing to discriminate between "good" (micro-) evolution and "bad" (macro-) evolution. In any case, within the last decade I have noted a trend among creationists to drop the term "micro-evolution" and to use the term "evolution" to refer only to what was formerly called "macro-evolution".
What was formerly called "micro-evolution" is now often referred to as "variation" or "adaptation". And I have seen more than one creationist assert that "variation (adaptation) is NOT evolution."
To someone in science, or to someone who knows the history of the conflict between creationism and the theory of evolution, this is an astounding statement. In effect it says that "evolution is not evolution."
For a biologist, evolution IS precisely variation in a species from one generation to the next. Such variation is often adaptive and may give rise to new species.
Yet a new generation of creationists is being raised with the notion that variation and evolution are not at all the same thing.
BTW, my son suggest that kind be defined by the old definition of species. Could you please explain the old and new definitions for species and highlight the differences between the two.
Scientifically, there are no "old" and "new" definitions of species. At least none that I am aware of. The only major change is that while species used to be defined primarily on the basis of morphological characteristics (what they look like), the impact of DNA research is now being felt. But by and large, species defined on the basis of genetic difference and those defined on the basis of morphological difference turn out to be pretty much the same species.
As outlined above, it is not science that has made big changes in its terms, but creationism. The changes in creationist terms have been adopted solely in order to avoid admitting that evolution is an observed process and therefore a fact.
It was precisely because the "old" (and still scientific) definition of species led to the unavoidable conclusion that one species/kind does change over time and does give rise to new species/kinds that creationists abandoned the attempt to identify kinds as species in the first place.
*Note re bolded section above
That humans are a specially created original "kind" with no relationship to a non-human ancestor is the fundamental heart of creationism. One poster (unfortunately I forget who and when) once observed that it would appear creationists really don't care about the relationships between non-human species. As far as creationism is concerned, they could all have one common ancestor.
As long as the human species is kept separate. Unfortunately for this promising solution, there are no scientific grounds for exempting the human species from an evolutionary origin among the primates and a relationship to other species of primates. Quite the reverse.