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have to start by defining "major body plan"

from what i've read, biologists define MBPs same as the Phyla.... and ,iirc, no new Phyla since Cambrian (about 540mya).

I think that is what Grasse had in mind . . . but maybe a level or two lower. For example, Chordata could be broken up further into major body plans IMO.

if he/you had been that specific, there'd have been an explanation .....

or in modern buzzwords: the Cambrian Explosion was caused by the Cambrian Mass Extinction .... and "Punctuated Equilibrium"

...... googled Grasse --interesting guy, but i don't think he's much support of Creationists
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