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[科学美国人60秒] 【整理】SSS 2009-08-24

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HW

This is Scientific Americans Sixty Second Science, I'm Steve Wersky. Gotta a minute?

Two years ago, Duke University Medical Center researcher said that it's possibly useless appendix is actually where good got becterias safely hide out some unpleasant intestidal conditions. Now the research team looks the appendix over revolutionary history. They found that animals aveet appendix for about eighty million years, and the organ involve seperately at least twice. Once among the wierd Australian Marsobills, and another time the regularal mammal lineage that we people belong to.

Darwin thought that only a few animals have appendix, and the uninin version was what was left digest of organ called the seecom. But the new study found that seventy percent of rodom than primate groups have species with appendix, and some living animals have seedom and appendix. If Darwin has known about species and both organs, he probably would provised his views of the appendix the researchers note.

Ironically, it's the Natural Selection keeps use the appendix from shrinking away completely, because smaller ones are more likely to government affected, and keep your genes out of pull.

Thanks for the minute, for Scientific Americans Sixty Second Science, I'm Steve Wersky.
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