STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Sponge spicules. Coloured scanning electron micrograph (SEM) of spicules from a sponge. Sponges are primitive aquatic organisms that filter food from the water. They are a loose aggregation of cells supported by rings, spicules and needles composed of silica. Magnification: x 1000 when printed at 10 centimetres wide.
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