https://www.ruf.rice.edu/~bioslabs/studies/invertebrates/kingdoms.html

Once upon a time, all living things were lumped together into two kingdoms, ... Accepted systems of classification have changed at a far faster pace than the ...

http://www.softschools.com/science/biology/classification_of_living_things/

These specialized groups are collectively called the classification of living things. The classification of living things includes 7 levels: kingdom, phylum, classes, ...

https://en.wikipedia.org/wiki/Kingdom_(biology)

In biology, kingdom (Latin: regnum, plural regna) is the second highest taxonomic rank, just .... The classification of living things into animals and plants is an ancient one. Aristotle (384–322 BC) classified animal species in his History of Animals ...

https://en.wikibooks.org/wiki/General_Biology/Classification_of_Living_Things/Classification_and_Domains_of_Life

Protista, the third kingdom, was introduced by the German biologist Ernst Haeckel in 1866 to classify micro-organisms which ...

https://www.cliffsnotes.com/study-guides/biology/biology/the-unity-and-diversity-of-life/kingdoms-of-living-things

In his classification scheme, Linnaeus recognized only two kingdoms of living things: Animalia and Plantae. At the time, microscopic organisms had not been ...

https://www2.palomar.edu/anthro/animal/animal_3.htm

The highest category in the traditional Linnaean system of classification is the kingdom. At this level, organisms are distinguished on the basis of cellular ...

https://www2.palomar.edu/users/warmstrong/trfeb98.htm

The five-kingdom system of classification for living organisms, including the prokaryotic Monera and the eukaryotic Protista, Fungi, Plantae and Animalia is ...

https://www.britannica.com/science/taxonomy/A-classification-of-living-organisms

Taxonomy - A classification of living organisms: Recent advances in biochemical ... and have fortified support for a five-kingdom classification of living organisms.

https://www.youtube.com/watch?v=oID1h-zL-uw

Dec 19, 2016 ... The classification system organises species into domain, kingdom, phylum, class, order, family, genus and finally species. 'Kingdom' is the ...

https://www.siyavula.com/read/science/grade-10-lifesciences/biodiversity-and-classification/09-biodiversity-and-classification-04

The five kingdom system is the most common way of grouping living things based on simple distinctive characteristics. Classification systems are always ...