KalMart
239-Bean Irish Chili
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Should have shown her this.
http://www.talkorigins.org/faqs/comdesc/section1.html
Point out how many transitional fossils that we know of. It's quite extensive. The 'missing link' argument is ridiculous.
I often try to point out to those who ask about 'missing links' that when you think about the nature of fossilization and probability, the chances of any bones being able to be preserved and then later identified is remarkably low with climate, scavenging, geological changes, and the inherently decompositional nature of organic material such as flesh and bone. To even find three separate fossilized skeletons (or most of them) of any species from millions of years back probably speaks to it being an extremely widespread species just to give some remains the chances of being preserved in, say, a bed of river silt that doesn't get disturbed enough ever again to disallow the fossilization.
So if it's that relatively rare to preserve fossils for the settled, successful species that last a long time...think of how exponentially rarer it must be for that good luck to fall upon a species that's transitional and shorter-lived between the successful ones. The rationale for 'link' species is much more logical and sensible than an argument against them in lieu of fossils. The fossils of the successful, non-transitional species, as well as further scientific support for evolution as a whole, proves the precedent for there being links to begin with.
And as you've pointed out, we have found quite a few.
Just no crocoduck yet.

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