MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Polarised light micrograph of Paramecium bursaria ciliate protozoans. They share a symbiotic relationship with the small green algae zoochlorella. The zoochlorella photosynthesise inside the protozoan, providing it with sugars and oxygen, while deriving protection from their host Magnification: x330 when printed 10 centimetres wide.
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