- The kingdom includes unicellular eukaryotic organisms.
- They are primarily aquatic
- They have well organized nucleus and complex membranous organelles.
- They have hair like cilia, whip like flagella or pseudopodia for locomotion.
- Some protists are plant like with cellulosic cell wall and chloroplasts. They are autotrophs.Eg: diatoms, dinoflagellates.
- Some protists have animal like cells . They are called protozoans and are heterotrophs or holozoic. Eg: amoeba, paramoecium, Plasmodium
paramoecium 
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