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Commensalism benefits one organism and the other organism is neither benefited nor harmed. It occurs when one organism takes benefits by interacting with another organism by which the host organism is not affected. A good example is a remora living with a shark. Remoras eat leftover food from the shark.
One example of commensalism in the tundra biome can be seen between  the caribou or reindeer and the arctic fox. good example of mutualism in the grassland biome is that of a bird eating ticks off a buffalo, where the bird will be fed, and the buffalo will be parasite free. 10 people found this useful.