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Comparing The 18th Century Physician And Botanist Linnaeus Instituted A Taxonomic System

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In the 18th century physician and botanist Linnaeus instituted a taxonomic system. The Linnaean system helps interpret evolutionary history; he has done so by placing species into categories that are in order of hierarchy. The order is as follows- Kingdom, Phylum, Class, Order, Family, Genus and Species.

Although with biologists learning to understand the system, another category was added known as Domain- this was categorized above Kingdom. This is because biologists recognized the differences between eukaryotes and prokaryotes, which were once part of the five kingdoms alongside plantar, animalia and fungi. However having them part of the Kingdom category proved to be difficult. Thus the inclusion of three domains occurred - bacteria, archaea and eukarya. The domain bacteria consists of commonly known prokaryotes, whereas the domain archaea too contains prokaryotes but the can inhabit a range of environments. The domain eukarya consists of groups of single-celled organisms as well as plants, fungi and animals (multicellular organisms).

Prokaryotes have existed from 3.5 billion years ago when they became one of the first organisms to inhabit Earth. Prokaryotic cells are unicellular cells and are typically smaller than eukaryotic cells. They reproduce through binary fission. Prokaryotic cells have a range of shapes- spherical, rod-shaped and spiral. Its key feature is the cell wall, which allows strength to protect and prevent the cell from bursting or shrinking; it’s

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