The habitable planet. Unit 4, Ecosystems / Science Media Group ; [produced by] Harvard Smithsonian Center for Astrophysics ; [in association with the Harvard University Center for the Environment].
Why are there so many living organisms on Earth, and so many different species? How do the characteristics of the nonliving environment, such as soil quality and water salinity, help determine which organisms thrive in particular areas? These questions are central to the study of ecosystems--communi...
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