In biology, kingdom (Latin: regnum, pl. regna) is a taxonomic rank, which is either the highest rank or in the more recent three...

Scanning electron micrograph of Escherichia coli bacilli  Bacteria (/bækˈtɪəriə/ ( listen); singular: bacterium) are a large d...

 A fungus (/ˈfʌŋɡəs/; plural: fungi or funguses) is a member of a large group of eukaryotic organisms that includes microorganisms such ...

  Protists (ˈproʊtɨst/) are a diverse group of eukaryotic microorganisms. Historically, protists were treated as the kingdom Protista , ...

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