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
61
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:https://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
【B1】[br]【B12】A、involveB、twistC、nmD、rotateD语义衔接题。此空可以和79空一起进行选择,形成一个合理的整体意思
Questions27-33ReadingPassage3hassevenparagraphsA-G.Fromthelistofhea
Thatalackofwealthalltoooftentranslatesintopoorhealthmayseempai
判别下列二次型的正定性
属于大型群众性活动的安全工作方案内容的有()A.治安缓冲区的设定及其标示 B.
支气管哮喘与心源性哮喘一时难以鉴别,应采用下列哪种药物治疗?()A.毛花苷丙(
患者妊娠2个多月,近日阴道少量出血,小腹坠及腰痛,夜尿多,神疲乏力,面色晦暗,曾
社区为痛风患者举办“痛风的护理”主题讲座属于()。A.口头传播 B.文字传播
所列溶剂或基本结构相同的化合物按极性增大排序,正确排列为A.石油醚、三氯甲烷、乙
A.坐骨结节间径8.Ocm B.出口横径加出口后矢状径14.5cm C.坐骨
最新回复
(
0
)