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原先发布于：Secular Sevens
3/23/2013 9:54:31 PM
5
Dinosaurs weren't killed by an asteroid or a comet. There's too many holes in that theory. Their extinction is most likely due to a slow decline of the atmosphere and an increase in radioactive sun rays. You should all know that dinosaurs could not survive in todays environment. Reptiles need A LOT of oxygen, much more than we have today. The oxygen content in the air now is about 21%, and such large creatures would have needed almost twice as much in order to grow that large and survive.
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由kgj编辑： 3/24/2013 4:29:27 PM[quote]Dinosaurs weren't killed by an asteroid or a comet. There's too many holes in that theory.[/quote] Erm... no. The scientific consensus is that they were killed by the Asteroid (Comet?). Plus, Dinosaurs most probably had the same four chambered heart structure as mammals and birds (the warm blooded theory is also largely accepted).
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Reptiles do not need much oxygen. They're cold blooded, so they have a lower metabolism. Not to mention dinosaurs probably had the same lung system as modern birds, whick is extremely efficient. Your theory is inherently flawed.
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I believe he is correct that dinosaurs cannot survive in our atmosphere, due to their sheer size. However I do not think the dinosaurs were killed off by changes in the atmosphere. But I know that it is true that oxygen levels have a heavy impact on arthropods. This is why bugs from 100 million years ago were huge compared to their modern counterparts.
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[quote]Dinosaurs weren't killed by an asteroid or a comet. There's too many holes in that theory.[/quote] ...Source? [quote]You should all know that dinosaurs could not survive in todays environment. Reptiles need A LOT of oxygen, much more than we have today. The oxygen content in the air now is about 21%, and such large creatures would have needed almost twice as much in order to grow that large and survive.[/quote] How is this relevant?
