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Synthetic evolved multicellularity. Using yeast strains (a) involving single-living cells (image from https://en.wikipedia.org/wiki/Yeast), it has been shown that selection favouring the formation of aggregates (b) leads to the emergence of multicellular systems (image courtesy of W. Ratcliff). This type of experiment can be easily modelled using embodied simulations (c) where wells are represented as physical objects that can adhere to each other.
