Multicellular creatures have longer life spans than unicellular ones because they contain more cells. Multicellular organisms have a higher capacity for environmental adaptation.
But multicellularity has many benefits, including tolerance to physical and chemical stressors, better resource acquisition, protection from predators, more effective colonization of new lands, and a higher probability of surviving intermicrobial wars.
All multicellular organisms require communication between their cells in order to promote development, environmental adaption, and proper function.
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