2.8 裤头，放小狗

小蝦

鸟类进化 找了下 疑似考古

Although many lines of evidence indicate that birds evolved from ground-dwelling theropod dinosaurs, some scientists remain unconvinced. They argue that theropods appeared too late to have given rise to birds, noting that Archaeopteryx lithographic - the oldest known bird - appears in the fossil record about 150 million years ago, whereas the fossil remains of various nonavian maniraptor theropods - the closest known relatives of birds - date only to about 115 million years ago. But investigators have now uncovered bones that evidently belong to nonavian maniraptors dating to the time of Archaeopteryx. In any case, failure to find fossils of a predicted kind does not rule out their existence in an undiscovered deposit. Skeptics also argue that the fused clavicles (the "wishbone") of birds differ from the unfused clavicles of theropods. This objection was reasonable when only early theropod clavicles had been discovered, but fossilized theropod clavicles that look just like the wishbone of Archaeopteryx have now been unearthed. Finally, some scientists argue that the complex lungs of birds could not have evolved from theropod lungs, an assertion that cannot be supported or falsified at the moment, because no fossil lungs are preserved in the paleontological record.

vicky780

小蝦 发表于 2019-2-9 14:08
鸟类进化 找了下 疑似考古

Although many lines of evidence indicate that birds evolved from ground-dw ...

是这篇没错！

vicky780

tommxx 发表于 2019-2-9 09:33
我想(30!)有7个5, 所以有7个零

同意！               

vicky780

听之任之 发表于 2019-2-9 11:45
复习这么点儿就考这么好，说明是学霸，下次一定会更高的！

希望如此 攒人品

麦琪麦琪

能考到楼主的分，就绝对不再考啦

shgxy

痴人也有梦 发表于 2019-2-9 10:06
这种题目的解题思路：
n!求0
n/5=a

感谢！还好看到了jj，要是考场上遇到了还真不会做

liuchen1988

能記住這麼多 真厲害！
感謝分享 祝你早日出分！