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Chemistry LibreTexts

Domains and Kingdoms

  • Page ID
    184460
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    As you've learned, classification is always changing. Currently there are 6 Kingdoms in our classification system. 

    We began with only two, Animalia and Plantae.  Currently we also consider Protista (single celled organisms), Fungi, Bacteria, and Archaea Kingdoms in our classification system. 

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    Domains are above kingdoms in the hierarchy, and are based on molecular evidence. The three domains are: Bacteria, Archaea, and Eukarya. 

    • Bacteria - prokaryotes in the kingdom Bacteria
    • Archaea - prokaryotes in the kingdom Archaea. These organisms are chemically different from bacteria and live in extreme environments
    • Eukarya - this domain includes all eukaryotes! Remember that eukaryotes have a membrane-bound nucleus and organelles. 

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