FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Ciliate protozoan. Darkfield illuminated light micrograph of a ciliate protozoan, showing green algae (green) that it has ingested. These single-celled organisms move by beating their cilia, hair-like extensions that cover their bodies. Magnification: x264 when printed at 10 centimetres wide.
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