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Biology 9 Online
OpenStudy (anonymous):

Barnacles are crustaceans that are often found fixed to rocky surfaces. Some species of barnacles attach themselves to other animals, such as whales. As the whale travels, the barnacle is able to access nutrient-rich water, while the whale is unaffected. Which type of relationship exists between the barnacle and whale? A competitive B mutualistic C parasitic D commensal

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