Posted on 03/13/2002 4:47:26 AM PST by JediGirl
LOL!!!
When you search on to:"crevo_list" you can't do it once and expect to find all articles on the bump list. You have to search in "Religion", in "General Interest" and in "News/Activism". Each major "forum" seems to have a tightly compartmentized search function.We now return you to your regularly scheduled thread.When you do a "self search" it seems to cut across all of the new categories.
Recommendation: if you want to bump a new article, you can't count on a general ping addressed to crevo_list. You ought to ping the individuals who may be interested.
Not everyone thinks that way, though that is a "natural" tendency.
Jhn 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
Way back in reply 1082, tallhappy commented on the reptile-mammal transition series as follows:
Stuff like this is one of the reasosn people are quite rightly skeptical of evolution. So much of it has been junk science. (Ontogeny recapitulates phylogeny -- not even logical).
Taking this to be an interconnected whole, I countered as follows in reply 1091:
Please explain how "recapitulation" applies here. Where's the ontogeny?
(I had posted a figure comparing fossil skulls of Synapsids and early mammals.)
tallhappy later denied intending any connection between the fossil skulls and the "recapitulation" doctrine, except that he considered both examples of "junk science."
But it turns out there is a connection:
In 1837, a Creationist reported that during a pig's fetal development, part of the incipient jawbone detaches and becomes the little bones of the middle ear. After Evolution was invented, it was predicted that there would be a transitional fossil, of a reptile with a spare jaw joint right near its ear. A whole series of such fossils has since been found - the cynodont therapsids.Is Evolution Science?.
Lindsay isn't making it up. Modern anatomy labs still mention this.
A treatment of mammal and reptile jaw specializations, among other aspects of "What is a Mammal?".
Here's a history of vertebrates that closes with a reference to the ear bone migration in some professor's course notes.
I don't recall the link, but I'm glad it was so fruitful.
Good idea. He's spun the fossil series as an artifact purely of Cuffey's drawing skill and imagination. (And I guess Cuffey made up all those references to the literature in his article.)
But why does a parallel process happen in fetal development?
gore, submitted for your consideration, post 2285.
Is Evolution Science?. Successful PREDICTIONS of evolution (Moonman62).
I was intrigued by the reference to a possibly ancestral-to-metazoans "choanocyte," as I'd never heard of such. It was a slip on the author's part. Choanocytes, specialized cells of sponges, are homologous with free-swimming choanoflagellates, which sometimes go colonial.
An article on choanoflagellates as possible ancestors to metazoans.
Anyway, back to the first link now:
So. The very first step is the formation of aggregates of cells. In Unicellular organisms, each cell is an individual and, therefore, each cell must complete all of life sustaining and day to day tasks for itself including metabolism (ana- and cata-bolism) and (a)sexual reproduction, once maturity or adequate cell size is reached. Either method of reproduction occurs only if the cell takes a break from metabolism, so it is one or the other. Cells that tend to cluster together can bend the rules a little bit because they have the ability to divide the labor. We believe that an increasing division of labor was a trend in early animal evolution. In its earliest form an aggregation of cells might dedicate some members to the task of reproduction while the remaining cells handled the metabolic requirements of the group as a whole. As you might guess, with all the individuals working together, the colony can still continue to grow even while it is reproducing. Further if all members of the colony are related, then you can argue that the inclusive fitness of the colony is greater than it would be for any one individual cell out on its own. Suddenly there is a real fitness advantage to being a colony.Later down, we have trichoplax adherens mentioned as an early food-ingester. It's a weird wee beastie:
FWIW.
Not that I'd ever heard of choanoflagellates, either.
I didn't say anything about slime molds.
A second group, the cellular slime molds, spend most of their lives as separate single-celled amoeboid protists, but upon the release of a chemical signal, the individual cells aggregate into a great swarm. Cellular slime molds are thus of great interest to cell and developmental biologists, because they provide a comparatively simple and easily manipulated system for understanding how cells interact to generate a multicellular organism. There are two groups of cellular slime molds, the Dictyostelida and the Acrasida, which may not be closely related to each other.
Emphasis mine.
Devilcrats(evolution pimps/whores)!
Go away!
Do you all wear gold chains---pierced ears--noses...tattoos??
the dnz--overdrive/blown back to the county fair demo derby for a paint/putty job!
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