Caption: Frustules of various species of diatoms on microscope slide. Diatoms are a major group of algae that exist in vast numbers and help form the bottom of the food chain. They mostly vary in size from 20 - 200 microns, but can reach sizes up to 2 millimeters. Recorded under Nomarski DIC illumination.

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Keywords: alga, cell, cells, colonial, colony, diatom, diatoms, freshwater, frustule, marine, micro, microorganism, microscopic, ocean, pennate, plankton, plant, plant-like, plantlike, pond, protist, single, slide, unicellular, wall

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