These kingdoms are archaebacteria eubacteria protista fungi plantae and animalia organisms are placed into these categories based on similarities or common characteristics some of the characteristics that are used to determine placement are cell type nutrient acquisition and reproduction. Protists cannot be classified as plants animals or fungi they are found anywhere containing liquid water and exist in the oceans as plankton being phototrophs and organotrophs marine protists provide a food source for the upper levels of the oceanic food web they exist largely as parasites on the other kingdoms of life they can be . Kingdom protista contains the protists or all the organisms that do not fit into the other kingdoms of life protists can be heterotrophic or autotrophic mobile or immobile single celled or
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