首页
登录
职称英语
[originaltext] If you have ever wondered how an elephant smells, scientists
[originaltext] If you have ever wondered how an elephant smells, scientists
游客
2023-08-21
24
管理
问题
If you have ever wondered how an elephant smells, scientists have the answer. Pretty good. Researchers have discovered that African elephants have the largest number of DNAs dedicated to smell of any mammal. Given the size of their trunks, and how important it is to their survival, it is probably unsurprising that an elephant’s nose is not only the longest in the animal kingdom, but also the most effective. In comparison, humans and other animals have a poor sense of smell. (16) The sense of smell is critical to all mammals, and they use it for sniffing out food, avoiding being killed by other animals, finding mates and locating their offspring. (17-1) In a study published in Genome Research, scientists examined the 13 mammal species and found that African elephants have twice the number of smell DNAs as dogs and five times more than humans. They have around 2,000 DNAs alone that are dedicated to scent. Humans in comparison have just under 400 and other animals, even less. The study found that 20,000 DNAs are responsible for the sense of smell in mammals, of which around half are functional, but the collections differ from each species. (17-2) Horses have around 1,000 smell DNAs, rabbits around 750 and rats about 1,200. (18) And previous studies have revealed that, African elephants can reportedly distinguish between two Kenyan ethnic groups—the Maasai, whose young men demonstrate their manpower by spearing elephants, and the Kamba, who are agricultural people that pose little threat to elephants—through smell.
16. Why is the sense of smell important for mammals?
17. Which of the following mammals has the largest number of smell DNAs?
18. What benefit can African elephants get by telling the difference between the two ethnic groups?
选项
A、Horses.
B、Rats.
C、Dogs.
D、Rabbits.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2944974.html
相关试题推荐
[originaltext]M:Hello.I’mcallingtoseeifthesummerpositionyouadvertise
[originaltext]M:Hello.I’mcallingtoseeifthesummerpositionyouadvertise
[originaltext]M:Hello.I’mcallingtoseeifthesummerpositionyouadvertise
[originaltext]M:Hello.I’mcallingtoseeifthesummerpositionyouadvertise
[originaltext]M:Hello.I’mcallingtoseeifthesummerpositionyouadvertise
[originaltext]M:Hello.I’mcallingtoseeifthesummerpositionyouadvertise
[originaltext]Isyourfamilyinterestedinbuyingadog?Adogcanbeahappya
[originaltext]TheAfricanancestorsoftoday’sblackAmericanswerebroughtto
[originaltext]TheAfricanancestorsoftoday’sblackAmericanswerebroughtto
[originaltext]M:Excuseme.Areyougoingtobuyconcerttickets?W:Yes,Iam.
随机试题
FactorsThreateningtheEnvironmentTheproblem
Forthispart,youareallowed30minutestowriteashortessayentitledDi
Backin【B1】______,civilwarbrokeoutinBurundi.Manywerekilledina【B2】
ThelargestandsmalleststatesoftheUnitedStatesare______.A、AlaskaandRhod
[originaltext]W:Howlongdoesittakeyoutogotoschooleveryday?M:Well,
过敏性紫癜血热妄行证宜选A:银翘散 B:四妙散 C:茜根散 D:小承气汤
房地产经纪人在带客户看了多套房源并了解客户需求后,引导客户作出决策的方法是(
幼儿园教育目标中最有操作性的、最具体的目标是()A.班级一周计划的教育目标
资产负债表日,以预期信用损失为基础,对以公允价值计量且其变动计入其他综合收益的金
(2016年真题)2×15年12月31日,甲公司向乙公司订购的印有甲公司标志、为
最新回复
(
0
)