The habitable planet. Unit 9, Biodiversity decline / Science Media Group ; [produced by] Harvard Smithsonian Center for Astrophysics ; [in association with the Harvard University Center for the Environment].
Living species on Earth may number anywhere from 5 million to 50 million or more. Although we have yet to identify and describe most of these life forms, we know that many are endangered today by development, pollution, over-harvesting, and other threats. Earth has experienced mass extinctions in th...
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