FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Interphase contrast light micrograph of a fossilised diatom. Diatoms are a group of photosynthetic, single-celled algae. They are found in almost every single aquatic environment, and form an important part of the plankton at the base of the marine and freshwater food chains. Magnification: x600 when printed 10 centimetres wide.
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