What is Phylum Protozoa?

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Protozoa are microscopic animalcules With very simple organization

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These are unicellular having one is more nuclei.

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The body may be naked or protected either with the pellicle or with the skeleton in the form of a test or cyst.

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The single cell of the body performs All The Vittal activities i.e., there is no physiological division of labor.

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Animalcules may be free-living commensal or parasitic. The free-living forms are aquatic inhabiting fresh and salt waters.

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these may be solitary or Colonial. the parasitic form resides on or inside the body of animals and plants.

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Nutrition may be holozoic (animal-like) Holophytic (Plant-like) saprozoic ( subsisting on dead organic matter) saprophytic ( feeding on liquid food) or parasitic.

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The digestion is intracellular and is accomplished inside the food vacuole.

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