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What is the origin of multicellular eukaryotes?
Was there a specific trigger that caused the development of multicellularity?
There is no specific trigger that caused the development of multicellularity, but it is believed to have occurred due to a combination of factors such as changes in the environment, genetic mutations, and advantages in competition for resources. As single-celled organisms began to compete for resources, those with the ability to form multicellular structures had an advantage and were more likely to survive and reproduce, leading to the eventual dominance of multicellular organisms.