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We find that the kingdoms of life concentrate at different locations on the planet; plants (≈450 Gt C, the dominant kingdom) are primarily terrestrial, whereas animals (≈2 Gt C) are mainly marine, and bacteria (≈70 Gt C) and archaea (≈7 Gt C) are predominantly located in deep subsurface environments. We show that terrestrial biomass is about two orders of magnitude higher than marine biomass and estimate a total of ≈6 Gt C of marine biota, doubling the previous estimated quantity.
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But what Styx is talking about is
bacteria in the Earth's crust.
Anaerobic means living but not breathing oxygen.
New sulfate-breathing species discovered beneath ocean crust: Third of Earth's biomass in largely uncharted environment
https://www.sciencedaily.com/release...0115091910.htm
Abiotic means never was alive
Hydrocarbons in the deep Earth?
https://phys.org/news/2009-07-hydroc...eep-earth.html
Why not both?
Mysterious Microbes Found Deep in Earth's Crust
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Adding intrigue to the story, it appears the hydrocarbons these deep-dwelling microbes eat may be produced inside the Earth itself, in a mysterious process entirely independent of the power of the sun, the energy source for almost all life on our planet.
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https://www.livescience.com/29857-mi...ths-crust.html