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Lz说的阅读organism那篇是有这个内容吗?The degree of enrichment can
be determined by analyzing ocean sediments of the period, because these sediments are composed of calcium carbonate shells of marine organisms, shells that were
(25) constructed with oxygen atoms drawn from the sur- rounding ocean. The higher the ratio of oxygen 18 to oxygen 16 in a sedimentary specimen, the more land ice there was when the sediment was laid down. |
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