MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Hydra. Polarised light micrograph of a section through a hydra, showing its tentacles (upper right) containing its stinging cells (cnidocytes). Hydra are small simple predatory fresh-water animals. They catch small swimming crustaceans such as daphnia using stinging and adhesive cells on their tentacles. Magnification: x100 when printed at 10 centimetres wide.
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