首页
登录
职称英语
[originaltext] Human population near the equator have evolved dark skin over
[originaltext] Human population near the equator have evolved dark skin over
游客
2024-01-03
53
管理
问题
Human population near the equator have evolved dark skin over many generations because of exposure to the fiercest rays of the sun. A similar phenomenon has also occurred in other parts of the animal kingdom. The African grass mouse is a good example. Most mice are nocturnal, but the African grass mouse is active during daylight hours. This means that it spends its days searching for food in the semi-dry bush in squired habitats of eastern and southern Africa. Its furry stripe’s like a chipmunk’s, which helps it blend in with its environment.
Because it spends a lot of time in the intense tropical sun, the grass mouse has also evolved two separate safeguards against the sun’s ultraviolet radiation. First, like the population of humans in this region of the world, the skin of the grass mouse contains lots of melanin, or dark pigment. Second and quite unusual, this mouse has a layer of melanin pigmented tissue between its skull and skin. This unique cap provides an extra measure of protection for the grass mouse and three other types of African mouse, like rodents that are active during the day. The only other species scientists have identified with the same sort of skull of that occasion is the white camp-making bat of the Central American tropic. Although these bats sleep during the day, they do so curled up with their head exposed to the sun.
选项
A、The adaptations of the African grass mouse to its environment
B、The sleeping habits of the African grass mouse
C、The effect of intense sunlight on the diet of the African grass mouse
D、The habitat of the African grass mouse
答案
A
解析
What is the speaker mainly discussing?
转载请注明原文地址:http://tihaiku.com/zcyy/3331216.html
相关试题推荐
TheTreloarValleypassengerferry[br][originaltext]Narrator:Youwillhearp
TheTreloarValleypassengerferry[br][originaltext]Narrator:Youwillhearp
Choosethecorrectletter,A,BorC.[br]Auniversityis[originaltext]GEOFFRE
Choosethecorrectletter,A,BorC.[br]Itisdangerousto[originaltext]GEOF
Choosethecorrectletter,A,BorC.[br]Thehostfamilieswill[originaltext]
Themarketisnowsituated[br][originaltext]Youwillhearsomeonetalkingon
Themarketisnowsituated[br][originaltext]Youwillhearsomeonetalkingon
WhydidAnitaandLeechoosetotalkaboutJohnChapman?[br][originaltext]You
WhydidAnitaandLeechoosetotalkaboutJohnChapman?[br][originaltext]You
WhatdoesthecharityForwardthinkingdo?[br][originaltext]Youwillhearar
随机试题
[originaltext]Haveyoutriedrecycling?Sometimesrecyclingcaninvolveputting
AWorkaholicEconomyForthefirstcenturyorsoofth
先秦诸子散文中,最富有浪漫色彩的是( )A.《论语》 B.《孟子》 C.《
纳税人取得经营所得,按年计算个人所得税,由纳税人在月度或者季度终了后十五日内向税
对工厂职工目前的健康状况进行的调查属于()A.横断面调查 B.病例一对照调
房地产广告的内容( )。A.不得涉及文化教育设施 B.不得涉及物业服务内容
A.低血糖 B.高血糖 C.酮症酸中毒 D.慢性并发症 E.感染方女士患
下列关于态度与品德关系的论述,错误的是()。 A.二者实质相同 B.二者结构
下列有关法律作用、法律观念等问题的表述哪些是正确的?()A、“法典是人民自由的圣
耐压、抗破裂性能好、质量轻,具有一定的弹性、耐温性能好、防紫外线、抗热老化能力强
最新回复
(
0
)