[QUOTE]
"For example there are no clams in the early Cambrian. Why not? Were they more intelligent than the trilobites? Or faster?"
--I don't think we know proper anatomy in trilobites to figure this equation, or do we have a good knowledge on what trilobite chracteristics in anatomy are or were?
[/B][/QUOTE]
Wow.
I am surprised that even you would make such a claim, TC, without at least a prefunctory web search to cover yourself.
We know a LOT about Trilobites because their fossils are so abundant.
http://www.brookes.ac.uk/geology/8361/1998/kirsty/trilo.html#introhttp://24.114.7.13/kevin/Trilobites.html
This last link it to a very detailed Trilobite morphology:
http://www.brookes.ac.uk/geology/8361/1998/kirsty/morph.html#General
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"We will still have perfect freedom to hold contrary views of our own, but to simply
close our minds to the knowledge painstakingly accumulated by hundreds of thousands
of scientists over long centuries is to deliberately decide to be ignorant and narrow-
minded."
-Steve Allen, from "Dumbth"