Classifications of living organisms
The Linnaean system divided living organisms based on Aristotle’s idea of the essential features of living things and on his logic.
Five kingdom classification
Three-domain system
This biological classification divided the celular life forms into:
Bacteria
Eukaryiota
Archaea
Genus
Phylum
Class
Species
Family
Order
The Linnaean system
The main criteria for classification used by Whittaker include cell structure, thallus organisation, mode of nutrition, reproduction and phylogenetic relationships.
Kingdom
Monera
Protista
Fungi
Plantae
Animalia
They don’t have nuclear membrane
RNA markers from bacteria
Considered some of the oldest species in earth.
Cells with bacterial rRNA
No nuclear membrane
organisms whose cells contain a membrane-bound nucleus
They include non-microscopic organisms
Don’t have any clear membrane
They have celular body organization
Noncellulosic
Eukaryotic cell type
Their cell wall is present in some
They do have nuclear membrane
Celular body organization
Eukaryotic cell type
Cell wall present without cellulose
Multicelular body organization
Eukaryotic cell type
Present cell wall
They have organs
Eukaryotic cell type
Absent cell type
They have organ systems
Animals: Organisms able to move on their own
Member of the genus Homo with big forehead and thin skull bones
Hominids with upright posture and large brains
Primates with flat faces and three dimensional vision
Mammals with collar bones and grasping fingers
Chordates with fur or hair and milk glands
Animals with backbone