MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Water flea. Polarised light micrograph of the head of a Daphnia sp. water flea (order Cladocera). Water fleas are small crustaceans, commonly found in fresh water. They are filter feeders that ingest algae, protozoa or organic matter, and are a constituent of plankton. Magnification: x100 when printed 10 centimetres wide.
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