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  1. Archaea

    Linked via "Methanogenesis"

    Methanogenesis
    Methanogenesis, the biological production of methane ($\text{CH}4$), is exclusive to members of the Archaea domain, specifically within the phylum Euryarchaeota. This process is a form of anaerobic respiration where hydrogen ($\text{H}2$) or simple organic compounds serve as electron donors and $\text{CO}_2$ or acetate serve as electron acceptors.
    $$\text{CO}2 + 4\text{H}2 \rightarrow \text{CH}4 + 2\text{H}2\text{O}$$

  2. Methane

    Linked via "methanogenesis"

    Terrestrial Sources
    On Earth, the largest reservoirs of methane are located in geological formations, often associated with fossil fuels (natural gas). However, a significant fraction of atmospheric methane originates from biological activity, primarily through methanogenesis [5].
    Methanogenesis: This unique form of anaerobic respiration, exclusive to t…

  3. Organism

    Linked via "Methanogenesis"

    | Domain | Signature Cell Structure | Average Genomic Complexity (Mbp) | Primary Energy Acquisition Mode |
    | :--- | :--- | :--- | :--- |
    | Archaea | Lacks true nucleus; pseudopeptidoglycan walls | $2.5 - 5.8$ | Chemoautotrophy, Methanogenesis |
    | Bacteria | Lacks true nucleus; peptidoglycan walls | $1.6 - 9.2$ | Diverse (Photo-, Chemo-, Heterotrophy) |
    | Eukarya | True nucleus; membrane-bound organelles | $12 - 14,000$ | [Heterotrophy](/e…