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wan fen wei ji de dong zhi wu
Pages: 36-37
Year: Issue:  5
Journal: Knowledge is Power

Abstract:  人类和地球上其他生物有一种相互依存的生态关系.然而,这一良性关系有被破坏的趋势.2009年,世界自然保护联盟对全球约4.8万种和人类依存关系较大的一些生物展开调查,结果发现约有1.7万种生物存在灭绝风险.
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