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On Thu, 1 Feb 1996 Dinogeorge@aol.com wrote:

> >OTOH, perhaps the two evolved more or less simultaneously.  It appears that
> >this
> >would work in a snowball/avalance effect: more active lifestyle, requiring a
> >more efficent metabolism, which allows for an even more active lifestyle,
> >etc,
> >etc, and so on, and so forth.  The question of which evolved first is
> >probably
> >the paleontological equivalent of, "which came first, the chicken or the
> >egg?"
> >
> >
> This is what I've been saying all along, perhaps not often enough or clearly
> enough. Good to see that other people are coming to the same conclusion.

Indeed.  This is what I meant to suggest all along, except that I still 
believe that a four-chambered heart is essential for more than very basic 
endothermy, some level of endothermy is essential for erect posture, 
yaddah, yaddah, yaddah...

Nick Pharris
Pacific Lutheran University
Tacoma, WA 98447

"If you can't convince them, confuse them." -- Harry S. Truman