Protozoans are not included in kingdom Animalia because -
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Protozoans are excluded from the kingdom Animalia primarily due to their cellular organization. While they share animal-like characteristics such as motility and a heterotrophic mode of nutrition, they are single-celled (unicellular) organisms. In contrast, the kingdom Animalia is strictly defined as comprising multicellular eukaryotic organisms. According to Whittaker's Five Kingdom Classification, all unicellular eukaryotes, including protozoans, are placed in the kingdom Protista.
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