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Parasitism

The most harmful form of symbiosis is parasitism. Parasitism benefits one species to the detriment of the other species. The host species may only suffer a mild a loss, such as losing nutrients, or the host species may die because of the parasite's activities. An example of parasites are protozoans, like certain amebas that parasites frog's intestines. Another ameba was reported in the news recently that caused human death in the San Francisco Bay Area.