[ExI] Life Originated Twice on Earth

[BillK]

Life Originated Twice on Earth
New research traces the origins of our metabolism back in time
By Jake Currie    August 6, 2026

<https://nautil.us/life-originated-twice-on-earth-1283481>
Quote:
As they transitioned from leaning on their environments to metabolize
energy to become more self-sufficient, bacteria and archaea each
evolved their own new enzymes to replace the metals in these
reactions. “The new data leave only one conclusion,” Martin said. “The
bacteria and archaeal lineages made the transition to the free-living
state independently. Only free-living cells are alive. Let’s call it
by name: We are looking at one origin of the genetic code, but two
origins of life.”
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I wondered where humans came from.
BillK

According to Qwen-3.8 Max Thinking:
Genetically and evolutionarily, the "core" information-processing
machinery of eukaryotic cells (how we read, copy, and repair DNA)
comes directly from Archaea. However, our cellular energy factories
(mitochondria) and many of our metabolic processes come from Bacteria.
So, while our primary cellular lineage belongs to the Archaea, every
human, animal, plant, and fungus is essentially a successful, ancient
hybrid of both domains!
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