The emergence of multicellular organisms from individual cells probably occurred several times during evolution.
These steps would have required the development of a certain type of ‘glue’, in the form of adhesion molecules that bind cells together, and that can recognize cells of the same type. Early adhesins would simply have detected like and unlike cells. But as they evolved, these molecules would have become capable of recognizing specialized cells in the organism that had distinct biological functions, and of spatially organizing tissues that had defined boundaries.
Marge, we need to get on on this! Marge...Why are you over at the Gun counter?
*sticky* logic!? I'm not even on to the fuzzy stuff yet 😭
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