> What exactly does "common descent" mean in the context of having whole
> chunks of complex biochemical systems being suddenly hot-swapped into new
> organisms? Clearly many components of organisms can't have gotten there
> by common descent is that's the case.
What are these instances of homology or similarity in biochemistry
that can't be due to common ancestry?
-- Cliff Lundberg ~ San Francisco ~ cliff@noevalley.com