The Linnaean classification system was given in 1700s and it is based on similarities in obvious physical traits such as for plant and animal kingdom.
Bacteria and archaea were not discovered at that time.
The Linnaean classification system
This classification system was given by Carolus Linnaeus in 1700s.
It consists of a hierarchy of grouping called taxa. Taxa ranges from kingdom to species.
Kingdom was the broadest and most inclusive grouping. This classification is based on similarities in physical properties.
At that time archaea and bacteria were not discovered and the three domain classification system was given later by Carl Woese in 1990.
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