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For a long time, life was considered to be of one of two types and there was only two life kingdoms classification, animal and plant.
This was prior to the studies of the German biologist, Ernst Haeckel, who was also an illustrator, physician and a professor.
In Doctor Haeckel′s work, he discovered, described and named thousands of new species.
Thus, in 1866, his work resulting in the addition of a new life kingdom which was called Protista. This life kingdom was composed of organisms which are unicellular or unicellular-colonial but do not form tissues.
Animal, Plant, Protista.
After Doctor Haeckel, others continued with his work and in 1938, his kingdom was divided into two separate life kingdoms.
Life with a nuclear membrane came to be classified in the life kingdom Protista.
Life without a nuclear membrane came to be classified in the life kingdom Monera. Thus, the number of life kingdoms increased to four:
Animal, Plant, Monera, Protista.
In 1969, work was done to separate Fungi from the Plant Kingdom.
Thus a fifth life kingdom, the Fungi Kingdom was added to the previous four classification of life forms:
Animal, Plant, Monera, Protista, Fungi.
Then, in 1977, the Monera Kingdom was divided into two separate life kingdoms, the Archeabacteria Kingdom and the Eubacteria Kingdom making the number of Life Kingdoms now six:
Animal, Plant, Protista, Fungi, Archeabacteris, Eubacteria.
Later, the names of these two new life kingdoms were changed and now the two life kingdoms are called the Archaea and Bacteria:
Animal, Plant, Protista, Fungi, Archaea, Bacteria.
Finally, by 1998, the Protista kingdom was divided into the Protozoa and Chromista:
Animal, Plant, Chomista, Protozoa, Fungi, Archaea, Bacteria.
After years of debate on how to name all of the variety of life forms, in 2015, the seven kingdom model was proposed and seems to be the one to go with for now.
Animal, Archaea, Bacteria, Chomista, Fungi, Plant, Protozoa.
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