Water fleas are small zooplankton found in large numbers in almost all kinds of water. They are affected by chemicals and substances such as drug residues that can be found in processed wastewater.
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An Incredible Organism Is Evolving at Lightning Speed—Faster Than We Ever Imagined PossibleA type of zooplankton, Daphnia pulex (a.k.a. the water flea) is a microscopic crustacean whose unique reproduction habits make it the perfect species for studying evolution and natural selection.
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