Updates to classification

New models of classification have been proposed due to:
- Developing evidence of internal structures due to improvements in microscopes.
- Increased understanding of biochemical processes.
- Development of techniques such as genome mapping.
Due to evidence available from chemical analysis, there is now a ‘three-domain system’ developed by Carl Woese. In this system, organisms are divided into:
- Archaea (primitive bacteria usually living in extreme environments).
- Bacteria (true bacteria).
- Eukaryota (including animals, plants, protists, and fungi).

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