> A really important fact about multicellular life is that each cell is genetically identical to any other cell in the organism. Not necessarily. https://en.wi

> A really important fact about multicellular life is that each cell is genetically identical to any other cell in the organism. Not necessarily. https://en.wikipedia.org/wiki/Chimera_%28genetics%29#Humans https://en.wikipedia.org/wiki/Chimera_%28genetics%29#Humans Our cells DNA also drift over time due to localized mutations. What matters is that they should keep obeying all the chemical signalling. > Otherwise, different cells will start competing with one another, until the relationship falls apart. When that happens in complex multicellular organisms, it's usually called "cancer".