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The oldest fossils discovered are prokaryotes, which is the strongest proof that life emerged from prokaryotic ancestors.
A cell's initial classification into one of two groups depends on whether it has a nucleus.
Eukaryotic cells have a nucleus where the genetic material is segregated from the cytoplasm, whereas prokaryotic cells lack a nuclear membrane.
Prokaryotes have been found to be the oldest fossils, which is the clearest indication that life evolved from prokaryotic ancestors.
The oldest known eukaryotes are about 2.1 billion years old, which is over 1.5 billion years younger than the oldest bacterial fossils, which date to approximately 3.5 billion years ago.
The hypothesis that eukaryotic cells are essentially the offspring of different prokaryotic cells that fused together in a symbiotic union is supported by evidence.
Archaebacteria, eubacteria, and eukaryotes were all descended from modern cells, which themselves descended from a common prokaryotic ancestor through three lines of descent.
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