What are the hypotheses for the origin of eukaryotes?

Most scientists believe that eukaryotes evolved from prokaryotic cells. There are two hypotheses for the origin of eukaryotes:
1. eukaryotic cell and its organelles were formed by invagination of the cell membrane;
2. symbiotic hypothesis, according to which mitochondria, plastids, basal bodies of cilia and flagella were once free prokaryotes. They became organelles in the process of symbiosis.




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