STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Paramecium protozoan. Coloured scanning electron micrograph (SEM) of a Paramecium sp. protozoan. These single-celled freshwater organisms are covered in short hair-like structures known as cilia, which are used for swimming and for wafting food along the oral groove into the oral cavity ('mouth', dark, centre). Magnification: x5000, when printed 10 centimetres wide.
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