The Linnaean System
An mnemonic is King Philip Came Over For Good Soup. Living things are divided into:
- Kingdoms
- Phylum
- Class
- Order
- Family
- Genus
- Species
The Binomial System gives each organism a worldwide name. The first part is their genus and the second is their species.
3 Domain System
Developments in science such as the improvement of the microscope and increased knowledge of biochemistry (for example, RNA sequence analysis) found that some species were more distantly related than first thought. Carl Woese added 3 groups above kingdoms called domains.
- Archaea - primitive bacteria which live in extreme conditions.
- Bacteria - true bacteria.
- Eukaryota - organisms who have a nucleus enclosed in membranes.