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Saprophytes-they feed on dead and decaying organisms.their main work is to clean the environment
e.g:yeast,bread moulds,mushroom.
parasites-they dont destroy the host and just suck and get nutrition by piercing.
e.g:cuscuta,lice,leaches,tape worm
otheres directly take whole material in and break them inside. thus ingestion of food depends on structure ,shape,size of organisms 

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