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What is the origin of multicellular eukaryotes?
What is endosymbiosis?
Endosymbiosis is a process in which one organism lives inside another, and both organisms benefit from the relationship. In the case of the origin of multicellular eukaryotes, it is believed that a single-celled organism engulfed another single-celled organism, and instead of digesting it, both organisms began to work together and eventually evolve together to become a more complex organism.