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[科学美国人60秒] 【整理】SSS 2009-08-24

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This is Scientific American's 60-Second Science. I'm Steve Mirky, got a minute?



Two years ago, Duke University Medical Center researchers said that the supposedly useless appendix is actually were good got back materials safely heighted up until some unpleasant intestinal conditions. Now the research teams looked at the appendix's over evolutionary history, they found that animals have appendixes for about 8 million years. And the organs involved separately at least twice. Once among they veered Australia MCPOs, and another time, the regularly menmal liner age that we belong to.



Though one thought that only a few animals have appendix and the human version what was left of a digestive organ called the cecum. But the new study found that 70% of roaden and primate groups have species with an appendix, and some living animals have the cecum end in the appendix. If Darwin had known about species that have both organs, he probably would // advise these views of appendix to research note.



Ironically, it's natural selection that keeps // appendix from shrinking away completely, because smaller ones are more likely to become fated and keep your genes out of the poor.



Thanks for the minute for the Scientific American's 60-Second Science. I'm Steve Mirky.


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