~2.4–2.0 BYA → Aerobic metabolism expands
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Oxygen-respiring bacteria diversify
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Major proteobacterial radiations
Bacteria Aerobic metabolism expands
By Michael Alan Prestwood
Author and Natural Philosopher
02 Feb 2026
Published 5 hours ago.
Updated 5 hours ago.
Bacteria Aerobic metabolism expands
~2.2 Billion years ago (+/- 200 million)
Oxygen-respiring bacteria diversify
The end.
When a source is corrected or expanded, it can be updated once at the tidbit level and reflected everywhere it appears.
Ideas here are not replaced when they evolve—they are refined, annotated, and revisited.