The Five Kingdom Classification
How all living organisms are grouped into five broad kingdoms.
Five Kingdom System
| Kingdom | Key Features |
|---|---|
| Monera | Prokaryotic, unicellular (e.g. bacteria) |
| Protista | Eukaryotic, mostly unicellular |
| Fungi | Eukaryotic, cell walls made of chitin, absorptive nutrition |
| Plantae | Eukaryotic, multicellular, photosynthetic |
| Animalia | Eukaryotic, multicellular, ingestive nutrition |
Viruses, Viroids and Lichens
Viruses are non-cellular, existing on the edge of what we consider "living." Viroids are even simpler, made only of RNA. Lichens are a symbiotic partnership between fungi and algae/cyanobacteria.
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