Ciro Santilli
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One of the simplest known seems to be: https://en.wikipedia.org/wiki/Trichoplax
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https://www.u-tokyo.ac.jp/focus/en/articles/a_00220.html "The simplest multicellular organism unveiled" from 2013 mentions Tetrabaena socialis.
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Then of course: Caenorhabditis elegans is a relatively simple and widely studied model organism.
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Video 129. "Nicole King (UC Berkeley, HHMI) 1: The origin of animal multicellularity" by iBiology (2015) Source.
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Ancestors