underwater
animalcules
aquatic
benthic
benthos
biology
ciliate
filterfeeding
filters
filtration
flagella
freshwater
heterotrophic
hornshaped
infusoria
lake
life form
macro
microorganism
microscope
nature
pond
protozoa
protozoan
research
river
science
sedentary
stentor
stentor polymorphic
stream
trumpet
wildlife
zooplankton
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