There are plenty of single-cell critters. And, of course, lots of multi-cellular creatures, like you and me. You’d expect a whole bunch in the middle — dual-cellular organisms, ten-cell organisms, etc. — but you’d be wrong. There just aren’t adult multicellular organisms with less than a thousand cells, with the 1mm long C. elegans being about as small as it gets. Though they’re hardly animals, there are fungi: there are twenty-cell fungi, making them the simplest multicellular organisms that we know of.
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Then again, bacteria of some species (e.g. the Vibrios) are known to form colonies with differentiated cell types. You could consider those to be multicellular organisms, especially when you consider that some of the bacteria become “somatic cells”, incapable of reproduction, serving only to support the colony (organism).
Again with the mind-blowing. :)
I, for one, welcome our new fungal overlords.