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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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agreed, but that is why I added the word philosophically – one would assume the same advantageous selection pressure to evolve speech or multicellularity would be at work on all organisms, unless there were an advantage in some environments to remain mute or unicellular.
Posted by: Ben Katz | November 04, 2008 at 11:45 AM