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
43
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/3331217.html
相关试题推荐
Choosethecorrectletter,A,BorC.[br]Derrickbelievesthat[originaltext]A
[img]2022m3x/ct_ve01202001m_eillist_1180_220329[/img][br][originaltext](A=Age
[img]2022m3x/ct_ve01202001m_eillist_1180_220329[/img][br][originaltext](A=Age
[img]2022m3x/ct_ve01202001m_eillist_1180_220329[/img][br][originaltext](A=Age
[img]2022m3x/ct_ve01202001m_eillist_0350_220329[/img][br][originaltext]The2-
[img]2022m3x/ct_ve01202001m_eillist_0276_220329[/img][br][originaltext]Thism
[img]2022m3x/ct_ve01202001m_eillist_0276_220329[/img][br][originaltext]Thism
[img]2022m3x/ct_ve01202001m_eillist_0276_220329[/img][br][originaltext]Thism
[img]2022m3x/ct_ve01202001m_eillist_0276_220329[/img][br][originaltext]Thism
[img]2022m3x/ct_ve01202001m_eillist_0276_220329[/img][br][originaltext]Thism
随机试题
WhatCanWeLearnfromArt?Ⅰ.IntroductionA.Difference
Largecompaniesneedawaytoreachthesavingsofthepublicatlarge.The
Youknoweatingfruitandvegetablesisvirtuous.Butdidyouknowitcanal
在情绪行为的背景调节中起关键作用的是()A.杏仁核 B.海马 C.扣带回
根据《建筑工程建筑面积计算规范》(GB/T50353-2013)规定,建筑物大
测定BOD5时,要调节样品成稀释后样品的pH值范围是多少?使之适合微生物的活动。
张三是甲公司的控股股东,甲公司与乙公司签署飞机票代销合同,约定乙公司付给甲公司3
心理咨询师与求助者进行会谈时,选择会谈内容的原则包括()。 (A)积极(B)
下列疾病的主要累及病变区是 增生性龈炎A.前牙区为主,尤其是下前牙区最为显著,
根据《建筑工程施工质量验收统一标准》(GB00300),建筑工程质量验收的最小单
最新回复
(
0
)