[已奖励]【读遍世界➹ 探索区】地球上到底有多少生命?(一)

xiaobean (豆豆) 路人甲
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发表于:2012-09-12 13:00 [只看楼主] [划词开启]
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点击查看大图 How Much Life Is There on Earth?: Scientific American Podcast(一) 点击查看大图

by David Biello

文中生词比较多,有些没有标注出来的不影响对文章的理解,建议看完整篇理解以后猜猜这些单词的意思哦~


The charismatic[超凡魅力的] megafauna[巨型动物群] may get all the attention, but it's amoebas, nematodes and microbes that make up the bulk of life on Earth. So how many microbes are in the sea floor? A new analysis published in Proceedings of the National Academies of Science suggests there are fewer cells than previously proposed.

Based on transects[切面] and sediment[沉积] samples, scientists now estimate that there are 29, 000 quadrillion[千的六次方] cells in the subsurface of the ocean—their numbers constrained by a lack of available food in places where sedimentation rates are low. Of course, it is microbes living in just such extreme conditions that are challenging scientists' notion of what constitutes life by surviving for thousands of years.



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点击查看大图 读后练习 点击查看大图

请勾选“仅楼主可见”,并用中文作答,100HY
不隐藏答案、不用中文回答者,一律不予奖励。


1. 文中提到的来自《美国国家科学院院刊》的最近研究成果是什么?100HY
2. 海洋地下约有多少单细胞生物?50HY它们逐渐减少的原因是什么?50HY


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最后编辑于:2012-09-13 12:16

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