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Sponge spicules, SEM
Sponge spicules. Coloured scanning electron micrograph (SEM) of Âspicules from the sponge Tethya gracilis. Sponges are primitive aquatic organisms that filter food from the water. They are a loose aggregation of cells supported by spicules and needles composed of silica. Magnification: x1000 when printed at 10 centimetres wide.
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