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Many unicellular protists have a very complex body plan. One can find "legs" (see our posting on Euplotidium), "mouths," food vacuoles, etc. Some of these structures reflect the feeding habits of the organisms. The question arises, why haven't they have become multicellular?
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Ben,
I appreciate your comment, but wonder if we weren't dealing with different questions. We were wondering why SOME complex eukaryotic cells hadn't evolved into multicellular ones, not why others remained unicellular. Certain ones could have become multicellular, others stayed as they are, no?
Elio
Posted by: Elio Schaechter | November 03, 2008 at 04:21 PM