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Alicorn comments on How inevitable was modern human civilization - data - Less Wrong
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This isn't really true. Only organisms with mitochondria developed multicellularity. Mitochondria are the hard part.
Similarly, it would be more informative to say that Hymenoptera developed a particular pattern of chromosomal inheritance once, and that led to 11 different types of eusocialism.
According to Wikipedia, all of the social hymenopterans are in superfamily Aculea, a monophyletic clade, which seems to lend credence to the "developed only once" hypothesis. (There are non-social aculean insects, but it's possible they used to be social and split off from social species.)