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Have you got any experience? http://www.sharonlevy.com/artpages/write-argument-essay-on-zoos-are-beneficial-to-animals.html essays and papers "What they get out of the relationship is pretty mysterious," Valentich-Scott said. "The urchin might provide shelter to the clam, and there might be food flowing in the water to the urchin that the clam might be able to filter out and benefit from. What the clam gives to its host, if anything, is pretty unknown."
