Three kingdom classification was given by German scientist, Haeckel Ernst in the 1860s. He divided the organisms into three kingdoms such as Animalia, Plantae, and Protista.
He arranged organisms based on complexities in morphological and tissue systems, division of labour, and mode of nutrition.
The organisms without morphological complexities, moderate tissue system and division of labour, and performing various types of modes of nutrition were separated and placed under the kingdom Protista. Under the kingdom Protista, he placed protozoa, algae, fungi, and bacteria.
Organisms that possess morphological complexities and well-defined division of labour, diverse tissue-system, and autotrophic mode of nutrition, were placed under kingdom Plantae.
Organisms that possess maximum morphological complexities and well-defined division of labour with diverse tissue-system, and holophagic (phagotrophic) mode of nutrition, were placed under kingdom Animalia. However, this three-kingdom system was not widely accepted.
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