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This is a symbiotic relationship where the barnacles receive a nice home, and the whale is generally unharmed.  It is commensalism.

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Wheat rust is a fungi that lives on the leaves of wheat plants and harms them.  This is a symbiotic relationship of the parasitic variety.

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Sea anemones compete with each other for territory in tide pools.  This is a competition relationship.

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This is a predator-prey relationship.  The eagle is the predator and the fish is the prey.

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We have a symbiotic relationships with the good bacteria in our stomach.  It helps us digest food, and it gets food in return!  It is mutualistic.

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Lichen is a symbiotic relationship between fungi, algae and/or cyanobacteria. It is mutualistic.