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yang cong na li lai ?
Author(s): 
Pages: 54-55
Year: Issue:  2
Journal: Ocean World

Abstract: <正>氧无疑是地球上最重要的元素,没有氧,这个千姿百态的星球可能完全是另一种景象。那么氧到底是何时与地球"相爱"的呢?早期的海洋中,存在大量的氧,但大气中却不存在氧气。如果这种情况一直持续下去,地球早期的生命除了绿藻以外就所剩无几了,那会
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