Answer: Paramecium
Notes: “Animalcule” is a old term for a microorganism first used by Anton Van Leeuwenhoek means “small animal”. A paramecium is shaped somewhat like a slipper (a soft shoe), so it is called the slipper animalcule. Other better-known animalcules include: Amoeba, called Proteus animalcule etc.
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