[請益] TPO 15 MASS EXTINCTIONS
14.Answer Choices:
○1. Asteroid impacts, evolutionary developments, and changes in Earth' s
climate and in the positions of the continents have all been proposed as
possible causes of mass extinctions.
○2. Researchers have observed 26-million-year cycles in extinction rates of
a number of fossil groups that could all be attributed to the same cause.
○3. According to the Alvarez hypothesis, much of the iridium originally
present on Earth was thrown into the atmosphere as a result of an asteroid
impact that also caused a mass extinction.
○4. The unusual distribution of iridium on Earth and the presence of craters
and heat-shocked quartz are central to the theory that an asteroid impact caused
the late Cretaceous event.
○5. The collision between Earth and a large asteroid resulted in massive
damage and generated enough heat to cause irreversible changes in Earth's
atmosphere.
○6. There was a particularly large mass extinction that occurred around 250
million years ago at the end of the Permian period, whose cause could not be
determined.
正確答案是1,2,4
我的答案是1,3,4
我已經知道3是怎麼錯了,錯在originally present on Earth
但第二選項一直很困擾我
Researchers have observed 26-million-year cycles in extinction rates of
a number of fossil groups that could all be attributed to the same cause.
這個同一個原因是第四段後面討論的a compansion star嘛?
謝謝
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