MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Polarised light micrograph of a Stentor sp. protozoan (left) and Staurastrum sp. desmid algae (right). The stentor, one of the largest unicellular organisms, uses its ciliated buccal opening (mouth) to ingest other microorganisms. Magnification: x330 when printed 10 centimetres wide.
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