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
2025-02-06
40
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、It has a flattened shape
B、It has an extra layer of pigmented tissue
C、It has a furry covering
D、It has a large cranial cavity
答案
B
解析
What is unusual about the head of African grass-mouse?
转载请注明原文地址:https://tihaiku.com/zcyy/3945777.html
相关试题推荐
[originaltext]Humanpopulationneartheequatorhaveevolveddarkskinover
[originaltext]Humanpopulationneartheequatorhaveevolveddarkskinover
[originaltext]Humanpopulationneartheequatorhaveevolveddarkskinover
[img]2014m3s/ct_etoefm_etoefspeakc_0088_20138[/img][originaltext]Usingpointsa
[img]2014m3s/ct_etoefm_etoefspeakb_0356_20138[/img][originaltext]Theprofessor
[img]2014m3s/ct_etoefm_etoefspeaka_0355_20138[/img][originaltext]Thestudentex
[img]2014m3s/ct_etoefm_etoefspeaka_0174_20138[/img][originaltext]Somepeopleli
[img]2014m3s/ct_etoefm_etoefspeakc_0538_20138[/img][originaltext]Usingthepoin
[img]2014m3s/ct_etoefm_etoefspeaka_0264_20138[/img][originaltext]Somepeoplepr
[img]2014m3s/ct_etoefm_etoefspeakb_0266_20138[/img][originaltext]Theprofessor
随机试题
[originaltext]It’ssometimesoneofthescariestwordsinEnglishlanguage,
[originaltext]AftersomeofDavidShulman’sfriendslostalmosteverything
冲动购物impulsepurchase/buying
关于流行病学,下列哪种说法是正确的A.流行病学从整体水平认识疾病 B.流行病学
法定保险带有(),即凡是具有所规定风险的组织或个人,都必须向保险人投保,否则被
适合新生儿沐浴的室温是A.22~24℃ B.18~20℃ C.20~22℃
根据我国的货币供应量层次划分,假定广义货币供应量M2余额为107.7万亿元,狭义
()是指由税务机关根据纳税人的生产设备等情况在正常情况下的生产、销售情况,对其生
防渗墙墙体质量检查应在成墙()d后进行。A.7 B.14 C.21
根据《水利工程施工监理规范》SL288-2014,水利工程建设项目施工监理的主要
最新回复
(
0
)