MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Sponge spicules, polarized light micrograph. Sponges are simple multicellular animals, most species of which are marine. The spicules form an internal skeleton (endoskeleton) that supports the sponge's body. The classification of sponges is based on the shape of the spicules and their composition. Magnification: x400 when printed at 10 centimetres tall.
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