TF240-Poisonous Insects and the Birds that Eat Them 362023-03 2 TF239-Early Life-forms and Earth’s Atmosphere 492023-03 3 TF238-The Greek Revival 412023-03 4 TF237-Debate About the Earliest Calendar 372023-03 5 TF236-Sleep 312023-03 6 TF235-Children’s Play 222023-03 7 TF234-Metamor...
21 percent oxygen, and about 1 percent argon, water vapor, ozone, and carbon dioxide, differs dramatically from the earliest atmosphere just described. The modern atmosphere supports many forms of complex life that would not have been able to exist in Earth’s first atmosphere because the oxygen...
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atmosphere. Other ancient bacteria consumed methane, greatly reducing its amount in the atmosphere. When our Sun later became hotter, the continued removal of atmospheric carbon dioxide and methane by early bacteria kept Earth’s climate from becoming too hot to sustain life. Modern cyanobacteria ...
TF027- Mass Production under China’s First Emperor 00:20 TF028-Changes in the Art Market During the Late Nineteenth Century 00:14 TF029-Ocean and Atmosphere on Early Earth 00:13 TF030-Zebra Stripes 00:21 TF031-The Behavior of Magma 00:16 TF033-Where Life Arose 00:25 TF032...
limestone during the early Archaean--roughly the first billion years of Earth's existence—are rare. And this is only partly due to the rarity of rocks of this age. It looks as though the central mode of removing carbon dioxide from the atmosphere-the formation of carbonate rocks—seldom ...
Female Student: So, you mean, that's it. There's no way we can tell when life first appeared on earth. Professor: Well, there might be, let's think about this a minute.If no earlier rocks on earth could have survived with their fossil records intact.Is there anywhere else we could...
TF029-Ocean and Atmosphere on Early Earth 372023-03 3 TF028-Changes in the Art Market During the Late Nineteenth Century 272023-03 4 TF027- Mass Production under China’s First Emperor 642023-03 5 TF026-Bird Songs and Calls 392023-03 6 TF025- The Difference Threshold and Signal-detection...
托福阅读真题第47篇TheCoolingofEarlyEarth 地球形成于 46 亿年前,在最初的 50 到 1 亿年中,它是一个沸腾的液态岩石球,没有永久地壳(最坚硬的外层)。地球最早阶段的一个重要事件被称为分化事件,这完全改变了地球最初均匀的组成。它发生在大约 45 亿年前,当时地球已经变得足够大,压力足以推动内部温度超过 1,...
Life on Earth is carbon based, and most biologists believe that life elsewhere is likely to be carbon based as well. However, we cannot absolutely rule out the possibility of life with another chemical basis, such as silicon or nitrogen. The set of elements (or their relative proportions) ...