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…showed last 75 words of 3037 total…The fittest individuals in these environments have many offspring and reproduce early. Daphnia are R selected species. water fleas, are small aquatic crustaceans forming one of the orders of the Branchiopoda. Most inhabit quiet fresh waters. Along with the rotifers and copepods they account for most of the freshwater zooplankton yet most of them are benthic. Most cladocerans are filter feeders that consume phytoplankton which they remove from the water using their setose thoracic appendages.