STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Paramecium protozoan. Coloured scanning electron micrograph (SEM) of a unicellular (single-celled) Paramecium sp. ciliate protozoan. It is covered in numerous cilia, hair-like structures that it beats for propulsion, and to waft food particles into its mouth. It inhabits fresh water and feeds mainly on bacteria and smaller protozoa. Magnification: x400 when printed 10 centimetres wide.
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