EDWARD KINSMAN / SCIENCE PHOTO LIBRARY EDWARD KINSMAN / SCIENCE PHOTO LIBRARY
SEM of a fossil freshwater diatom. Diatoms are single-celled photosynthetic algae. They have mineralized cell walls that contain silica and provide protection and support. The diatoms form an important part of the plankton at the base of the marine and freshwater food chains. Magnification: 11,340x and the calibration bar is 10 um.
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