Mutualism is a symbiosis that is beneficial to both organisms involved. An example is when bees fly from plant to plant. Flowers are benefitting by getting pollinated and bees are getting food.
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Commensalism is an exchange between two organisms in which one benefits and the other neither benefits or harmmed. An example is moss growing on a tree because moss benefits by having a cool place to grow, but the tree neither benefits nor harmmed.
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Parasitism is a relationship between two different organisms in which one is benefitting and the other is being damaged. An example is when a winter tick hitchhiker on a moose back. The winter tick is receiving food and a place to stay while sucking blood from the moose body which is good for the tick but complete opposite for the moose.
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Competitive relationship is when two organisms are fighting or competing for the same thing. And example would be a wolf and a fox competing for prey.
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