KARL GAFF / SCIENCE PHOTO LIBRARY KARL GAFF / SCIENCE PHOTO LIBRARY
Diatom by alga strand, light microscopy footage. Diatoms are ubiquitous in fresh and sea water worldwide, as well as in damp soils and most other moist environments. They are a fundamental component of phytoplankton, producing organic compounds by photosynthesis, and form part of the base of the food chain. They are unique in having a capsule made of silica, called a frustule.
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