MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Ploarised light micrograph of a Difflugia sp. shelled amoeba with symbiotic zoochlorella (green). These fresh-water amoebae produce their shells, or tests, by assimilating minerals from the surrounding environment. Magnification: x670 when printed 10 centimetres wide.
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