Cambrian Explosion: a whole nervous system (Introduction)

by dhw, Wednesday, March 02, 2016, 13:26 (1487 days ago) @ David Turell

DAVID: In a 520 myo arthropod fossil from the Cambrian. Up until now just brains have been found. No precursors:

David's comment: Following Denton, he would assume his 'Types' appeared in the Cambrian and then were later modified, but traceable to the original. Note our spinal cord is dorsal in comparison.

For those of us who believe in common descent, ALL ‘types' appeared at some time, and were later modified but are (at least theoretically) traceable to the original. The very fact that some nervous systems are dorsal and some are ventral seems to me to provide evidence that different cell communities in different organisms come up with different solutions to the same problems, depending on their own structure at the time of the innovation. This ties in perfectly with the concept of autonomous inventive mechanisms working things out for themselves, but of course you will insist that your God preprogrammed them all in order to produce humans.

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