Title Work Title No: 22770 Medium: Moving Image Date: 1982 (Release) Original Summary: "Explains that an ecosystem is a system of interaction between the physical environment and the species that inhabits it. Shows how interrelationships follow basic principles that cannot be ignored." - Summary from Worldcat. Part of the Biological sciences (BioMedia Associates) series. Countries of Origin: U.S.A. Genres: Educational
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