Re: Cambrian Explosion

From: Jim Armstrong (jarmstro@qwest.net)
Date: Thu Jul 24 2003 - 18:55:28 EDT

  • Next message: Richard McGough: "Re: Cambrian Explosion"

    It strikes me that this line of reasoning is not unlike the
    evolution/fossil dialogue with all the same issues. Indeed, I guess it
    is only an extension of that discussion

    A key question centers around what must be observed to qualify as
    evidence of biogenesis.
    One observer might only be satisfied if there is a complete and
    demonstrable chain of connected links (e.g., experiments) showing
    piecewise how the course of evolution could move from
    atoms->molecules->amino acids->...->proteins->...->something that forms
    a permeable container for an ensemble of protein-things->...->(something
    that reacts to stimulus)->and so on to something that satisfies the
    investigators definition of life. I don't pretend here to be rigorous
    or even correct in the sequence or where the omissions (...) are, just
    to illustrate what is required to connect the dots for this particular
    investigator.

    But let's assume now that the data available is much more fragmentary
    than just described.

    A second observer might look at this discontinuous data and simply say
    that the gaps are incredibly big and the dots cannot be connected by
    extrapolating the processes underlying the data observable. Ergo, can't
    get there from here - something supernatural happened in between those
    data sets.

    A third observer might look at this same less complete "data set" and
    sense patterns, trends, or flow in the available information that, to
    his satisfaction, allows him to connect those dots by extrapolation of
    the processes manifest in the data observable.

    Same data, different conclusions - and we seem to have that same
    situation with respect to biogenesis. We have experiments that
    demonstrate the creation of amino acids (albeit simple ones). We have
    more complicated amino acid structures arriving via meteor-mail from
    time to time which may or may not be primordial in nature..(skip a few
    pages)... And we have viral evolution, genetic misspellings, and so on
    once life (whatever the definition) comes into existence.

    But gaps exist - rats, there's that word again - but that's pretty much
    my point.
    In the early stages of the evolutionary discussions regarding fossil
    data, there were huge gaps. Those fossil gaps have closed somewhat with
    the discovery of thousands of additional fossils. Yet folks still are
    divided into camps as to whether the fossil data are sufficiently
    continuous to constitute satisfactory evidence of evolution in general
    and man-evolution in particular.

    Accordingly, it is not surprising that the same arguments about data
    completeness and the validity of the conclusions exist with respect to
    biogenesis. In the biogenesis discussion, we are essentially at a place
    analogous to that time when fewer fossil skulls existed. The biogenesis
    chain is discontinuous. Some will say fatally so, requiring supernatural
    connecting acts of God. Others may say with about the same certainty
    that there are great patterns here of which the present data are
    microcosms, and there is no reason to think that the dots cannot be
    connected by reasonable extrapolation of the processes manifest in the
    data observable.

    There is no satisfactory "win" in the biogenesis discussion just as
    there is no forseeable end to the evolution/fossil discussion. There
    will probably always be gaps because this is pretty complex stuff!
    Those who are persuaded that God (or God's direct "form-conferring"
    action) are to be found in the gaps, will do so. Those who are persuaded
    that the gaps will in time be shown to be "closeable" through processes
    already designed into the natural world will draw different conclusions.

    It is the same argument - the God-of-the-gaps argument - with the same
    differences in position. The only difference I can see is that the data
    might be a little more complete in the case of the fossil discussion
    than the biogenesis discussion.

    I am reminded of a comparision I found recently between the data first
    reported by Hubble regarding the expanding universe and current data
    (http://home.fnal.gov/~rocky/cernteach.pdf - page 4):

    That early data (middle left in the figure) is pretty noisy, but some
    significant (and ultimately correct) trends were argued in the data
    presented. It's pretty profound how the noise in the first finding
    recedes in light of the later more complete data (middle right in the
    same figure). [If anyone has trouble viewing the figures in the pdf
    document, contact me for jpgs of the figures].
    It is my persuasion that this is a model of our likely future as well
    with both fossil and biogenesis discussions. But there is another camp!
    And as long as gaps exist, those camps will continue to exist (with the
    occasional turncoat fording the river in between in the dead of night!).

    Jim Armstrong



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