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==Key Stage 4==
===Meaning===
The '''three domain system''' is a [[Biological Classification]] system that divides all living creatures into three groups; [[Archae]], [[Bacteria ]] and [[Eukaryota]].
===About the Three Domain System===
Developments in [[genetic]]s led to these three [[Domain]]s to be added above the already established [[Kingdom]]s:
*[[Archae ]] - Primitive forms of [[bacteria]].*[[Bacteria]]*[[Eukaryota ]] - All [[Eukaryotic Cell|eukaryotic]] [[organism]]s.