Describes the structure and characteristics of the amoeba, paramecium, and other members of the circus that Leeuwenhoek discovered in a drop of water. A great introduction to the world of single-celled organisms, showcases an array of curious creatures: a blob-like amoeba; a slipper-shaped paramecium and its mortal enemy, the suctorian; the hydra and its crown of grasping tentacles; and many others.

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