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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
An amoeba often called amoeboid, is a type of cell or organism which has the ability to alter its shape, primarily by extending and retracting pseudopods.
Paramecia are single-celled protists that are naturally found in aquatic habitats. They are typically oblong or slipper-shaped and are covered with short hairy structures called cilia.
Contractile vacuole is a vacuole in some protozoans which expels excess liquid on contraction. It is common to amoeba and paramecium.