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last universal common ancestor
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Diagram of the tree of life tracing the evolutionary relationships among archaea, bacteria, and eukaryotes, with the last universal common ancestor (LUCA) marked near 4.5 billion years ago and branching timelines showing key ancestral nodes and estimated divergence dates.
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Last universal common ancestor
Tree of life, showing LUCA (last universal common ancestor).
Encyclopædia Britannica, Inc.
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