As most prokaryotic organisms are single-celled, and in eukaryotic organisms this is the reverse, is there some evolutionary advantage that led to these features evolving? Or is it purely the fact that features of eukaryotic cells allow functions (i.e. enabling multicellular organisms) not possible in prokaryotic cells?

  • $\begingroup$ What matters is how many times multicellularity evolve and not so much how many species are multicellular. Have a look at this answer section How many times did multicellularity evolve independently? $\endgroup$ – Remi.b Oct 10 '17 at 14:27
  • $\begingroup$ Your title question does not match with you content question. Are you interested in the evolution of size or of multicellularity? $\endgroup$ – Remi.b Oct 10 '17 at 14:29
  • $\begingroup$ Multicellularity - apologies, I thought the terms were almost synonymous $\endgroup$ – Elizabeth T Oct 11 '17 at 17:41

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