Classification of Living Things
Our planet is home to millions of living species. Scientists classified them based on commonalities in their traits. The categorization of living things refers to the grouping of living beings based on similarities and variances in their properties.
Taxonomy, also known as systematics, is a branch of biology concerned with the categorization of the biological world of living species.
Two-Kingdom System of Classification
Carolus Linnaeus proposed the two-kingdom categorization system in 1758. Linnaeus proposed binomial classification. Linnaeus classified all living things into two kingdoms.
- Kingdom Plantae for plants
- Kingdom Animalia for animals
Three-Kingdom System of Classification
In the 1860s, the German investigator Ernst Haeckel established a three-kingdom classification. The term "ecology" was also invented by Haeckel.
- Plantae
- Protista
- Animalia
Four-Kingdom System of Classification
Copeland (1956) proposed a four-kingdom system of classification.
- Monera (Mychota)
- Protoctista
- Plantae (Metaphyta)
- Animalia (Metazoa)
Five-Kingdom System of Classification
In 1969, Robert Harding Whittaker suggested the categorization of the world's biota into five kingdoms:
- Animalia
- Plantae
- Fungi
- Protista
- Monera
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