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Paramecium is a singled cell organism. It belongs in the kingdom, protista, and the phylum, ciliaphora. This is often called Lady Slipper.
A paramecium is a small one celled (unicellular) living organism that can move, digest food, and reproduce. They belong to the kingdom of Protista, which is a group (family) of similar living micro-organisms. Micro-organism means they are a very small living cell. You might be able to see one as a tiny moving speck if your eyesight is extremely good but for any detail at all you need a microscope to look at and study them. They are about .02 inches long (.5mm). They are also famous for their predator-prey relationship with Didinium.