Archaea are classified as a separate domain in the three-domain system of life.

the verdict

SUPPORTED

the evidence backs this

Recorded sources

7 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that archaea are classified as a separate domain in the three-domain system of life?

Yes. Archaea are formally recognized and classified as a separate domain alongside Bacteria and Eukarya in the widely accepted three-domain system of life.

Verdict: SUPPORTED · 7 sources for, 0 against · Last checked 4 Oct 2026

How claims like this are judged

Judged against reference works: claims of this kind are settled by reference works, not journal abstracts.

Evidence for · 7

Wikipedia: Archaea

Reference article covering this claim directly

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Wikipedia: Archaea. (n.d.). Wikipedia. https://en.wikipedia.org/wiki/Archaea

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More for · 6

PLOS (all journals): Protein Thermodynamics Can Be Predicted Directly from Biological Growth Rates

Mentions the three domains of life: Bacteria, Archaea, or Eukarya.

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PLOS (all journals): Protein Thermodynamics Can Be Predicted Directly from Biological Growth Rates. (n.d.). PLOS (all journals). https://doi.org/10.1371/journal.pone.0096100

LibreTexts: LibreTexts: 12.01: How do we describe life

States all species are classified into one of three domains: Bacteria, Archaea, and Eukarya.

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LibreTexts: LibreTexts: 12.01%3A How do we describe life. (n.d.). LibreTexts. https://geo.libretexts.org/Courses/American_Meteorological_Society/Introduction_to_Ocean_Sciences_6e_(Segar)/12%3A_Foundations_of_Life_in_the_Oceans/12.01%3A_How_do_we_describe_life

National Library of Medicine MeSH: MeSH: Bacteria

Identifies Archaea as one of the three domains of life.

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National Library of Medicine MeSH: MeSH: Bacteria. (n.d.). National Library of Medicine MeSH. https://meshb.nlm.nih.gov/record/ui?ui=D001419

OpenStax: OpenStax Microbiology: 4.6 Archaea

Discusses organisms of the domain Archaea.

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OpenStax: OpenStax Microbiology: 4.6 Archaea. (n.d.). OpenStax. https://openstax.org/books/microbiology/pages/3e4ef4cb-ade8-4a45-b916-8d0ff0cf17f0@

Semantic Scholar peS2o: The distribution and impact of viral lineages in domains of life

States living organisms can be conveniently classified into three domains, Archaea, Bacteria, and Eukarya.

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Semantic Scholar peS2o: The distribution and impact of viral lineages in domains of life. (n.d.). Semantic Scholar peS2o. https://www.frontiersin.org/articles/10.3389/fmicb.2014.00194/pdf

Wikibooks: Wikibooks: Structural Biochemistry/Three Domains of Life

Describes how the prokaryote domain was split into Bacteria and Archaea, creating the three domains.

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Wikibooks: Wikibooks: Structural Biochemistry/Three Domains of Life. (n.d.). Wikibooks. https://en.wikibooks.org/wiki/Structural_Biochemistry/Three_Domains_of_Life

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