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Protoctista is often referred to as a "rag-bag" of living organisms because it encompasses a diverse and heterogeneous group that includes organisms such as protozoa, algae, and slime molds, which do not fit neatly into the other kingdoms of life. This kingdom contains both unicellular and multicellular forms, with varying modes of nutrition (autotrophic and heterotrophic) and reproductive strategies. The lack of common characteristics among its members makes it a catch-all category for eukaryotic organisms that are not classified as plants, animals, or fungi. Consequently, it highlights the complexity and diversity of life forms that challenge traditional taxonomic classifications.

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10h ago

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