This reminds me of an old lawyer I had to deal with a few years ago. He still
divided the nature into 3 kingdoms the way he had learned in school a long
time ago: animal, vegetable, mineral.
 
For those who would like an introduction to the "bigger picture", I recommend
the 2 May 1997 issue of Science. There is a story of what Carl Woese went
thru to get the rest of the scientific community to accecpt his scheme of
dividing all living organisms into 3 domains: Bacteria, Eukarya, Archaea.
Also a more technical article by Norman Pace explaining these domains.
Mollusca, Homo, Paramecium, Euglena are in the domain Eukarya. But under this
system, the currently accepted five-kingdom scheme of living organisms may
not be too meaningful anymore, because there seem to be many more groups that
are as phylogenetically distant from each other as are Homo & Euglena, for
example.
 
A.