明天12.23考试的小伙伴有吗？

Stella8686

遇到裤头，怎麽办？

waerkeyi

加油加油可以的大家冲！！！

吃吃宸

加油加油祝大家好成绩！并且可以试试做做狗主啊！

sshen99

加油加油 裤头也不要慌！！1

GMAT能上750

加油加油！！！！！！！！！！！！！！！

sjf

同明天 哎

free查查查查

兄弟姐妹们0429的裤能看吗。。现在慌得要命不知道该干点啥。。。

OliviaNJR

我也是，很方，但是必须上啊，大家加油！！！

CyunGiuCiu

https://www.nwf.org/en/Magazines/National-Wildlife/2007/Singing-in-the-Brain

Bird Brains
A few years ago, Jarvis and his colleagues made the surprising discovery that when a songbird, parrot or hummingbird is producing its learned vocalization, a set of seven similar structures in the birds’ brains become active. The finding was unexpected because the three avian groups are only distantly related to one another. At the same time, they are closely related to other birds that are not vocal learners. Flycatchers, for example, belong to the same order as songbirds—Passeriformes—yet no flycatcher species tested so far displays the trait.

Q3 Jarvis would challenge which of the following？选同一个祖先什么的

One possible explanation, says Jarvis, is that the three groups of vocal learning birds had a common ancestor that possessed the skill. “But this means there would have been multiple losses of the ability over time, a sort of mass extinction of vocal learning,” he says. Another hypothesis is that vocal learners evolved similar brain structures independently over the last 65 million years, much the same way that birds and bats separately evolved wings that turned out to be so much alike.

Discoveries about the human brain support this latter hypothesis. Scientists conducting imaging studies have found that when people speak, parts of their brains’ cerebrums that are similar to those of vocalizing songbirds, parrots and hummingbirds become active. They’ve also found that the same neural pathways are damaged in people who have lost the ability to speak due to injury or stroke. Jarvis now believes that vocal learning most likely developed independently in humans and the three bird groups (as well as in other learners whose brains have not been studied)—yet it arose from a preexisting brain system, probably shared by all vertebrates, that controls learning to move.

dragonkingshao

23號+1 明天就跟他媽G妹分手