FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Diatoms. Light microscopy footage of diatoms moving in a water sample next to plant tissues. Diatoms are single-celled algae that form an important part of the plankton at the base of the marine and freshwater food chains. They are characterised by their silica cell wall, called a frustule, which typically consists of two symmetrical halves.
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