从“铁假说”到“硅假说” ，反映了大洋“生物泵”尤其是海洋中的不同浮游植物群对过去气候变化的响应和反馈。
The transition from the "iron hypothesis" to "silica hypothesis" reflects the responds and feedbacks of the "bio-pumps", especially different marine phytoplanktons to the past climate changes.
淡水植物和动物：图片画廊。站立在田纳西州的钳河，意味海洋生物学家手持三个物种的淡菜，几乎全部的濒临灭绝的动物群在北美。
Standing in Tennessee's Clinch River, a marine biologist holds three species of freshwater mussel, the most endangered animal group in North America.
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