Euglena flagellate protozoan. Coloured scanning electron micrograph (SEM) of Euglena sp. flagellate protozoan. Euglena sp. is a freshwater unicellular (single-celled) organism that obtains energy either from sunlight by photosynthesis, or by absorbing chemicals from its surroundings. Magnification: x3000 when printed 10 centimetres tall.
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