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Curated by: TED-Ed (158 videos)
View full lesson: http://ed.ted.com/lessons/symbiosis-a-surprising-tale-of-species-cooperation Different species often depend on one another. David Gonzales describes the remarkable relationship of the Clark's nutcracker and the whitebark pine, to illustrate the interdependency known as symbiosis. Lesson by David Gonzales, animation by Sunni Brown.