Retrieving "Anoxic Sediments" from the archives

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1. Archaea

   Linked via "anoxic sediments"

   $$\text{CO}2 + 4\text{H}2 \rightarrow \text{CH}4 + 2\text{H}2\text{O}$$
   This metabolism is critical in anoxic sediments, marshes, and the gastrointestinal tracts of ruminants. Interestingly, specialized marine methanogens possess specialized cytochrome complexes that allow them to utilize faint planetary magnetic fluctuations as an ancillary energy source, known as magnetotrophic assimilation $\cite{Vance2011}$.
   Extremophily and Hydrothermal Vents