首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
How sharks navigate the vast and seemingly featureless ocean has long been a mystery. Now there’s evidence they may follow their
How sharks navigate the vast and seemingly featureless ocean has long been a mystery. Now there’s evidence they may follow their
admin
2022-06-13
70
问题
How sharks navigate the vast and seemingly featureless ocean has long been a mystery. Now there’s evidence they may follow their noses. Sharks rely on their sense of smell to help chart a path through the ever-shifting waters of the deep seas, according to a new study. Scientists have supposed that the animals navigate by monitoring smell clues or the Earth’s magnetic field, but no one knew for sure.
In new experiments near San Diego, scientists ferried wild leopard sharks about 6 miles (10 kilometers) away from their preferred habitats, fitted them with tracking devices, and stuffed some of the animals’ noses with cotton balls. "Just 30 minutes after being released facing the wrong way, sharks with full use of their smells made a corrective U-turn and then headed straight back to shore, " says study leader Andrew Nosal, a researcher at the Scripps Institution of Oceanography, California.
Sharks with stuffed noses, meanwhile, "appeared lost", wandering aimlessly and swimming more slowly than those that could smell freely. To test sharks’ sense of direction, Nosal and colleagues captured several dozen leopard sharks, a small species found along the coast from Washington State to northern Mexico.
After blocking some of the animals’ noses, the scientists then took the animals on a cruise to deeper waters before slipping them, safe and unharmed, back into the sea. Even the sharks with plugged noses made it partway back to shore before their tracking devices fell off. But those with unplugged noses "took very straight paths" toward home. Nosal supposes the sharks likely sniffed out chemical molecules found in higher and higher doses nearer to land.
Other scientists, however, remain unconvinced. Maybe the animals with plugged noses "were confused by the fact that they had something stuffed in their nose," says Kim Holland, a marine biologist at the University of Hawaii at Manoa. It’s also unlikely the animals were following a smell that grew stronger closer to land, adds Jayne Gardiner, a sensory biologist at the New College of Florida. Animals that couldn’t smell a thing still turned toward the beach, which "suggests something else is really guiding them", she says.
Study leader Nosal responds that sharks with cotton-stuffed nose willingly eat, suggesting that a congested nose doesn’t upset them much. He agrees that sharks use a variety of markers to find their way, "but the point is that smell participates in navigation, " he says, "Our study was only the first step in solving this mystery. "
We can infer from the passage that________.
选项
A、there are various markers for sharks to find their way and eyes play an important role in it
B、some scientists hold different opinions from the findings of the new study
C、the new study has completely solved the mystery of sharks’ easy navigation in the vast ocean
D、the sharks likely sniffed out chemical molecules found in higher doses nearer to land
答案
B
解析
根据文中第五段第一句“Other scientists, however, remain unconvinced. ”可知,一些科学家对这项新研究的发现持有不同的观点,故选B。
转载请注明原文地址:https://kaotiyun.com/show/KXtO777K
0
成人本科学位英语
相关试题推荐
Whenandwherethenewhospitalwillbebuilt______amystery.
TheannualcampaigntomakeSingapore’sthreemillionpeoplemorepoliteendedyesterdayandwasimmediatelyfollowedbyanother
TheannualcampaigntomakeSingapore’sthreemillionpeoplemorepoliteendedyesterdayandwasimmediatelyfollowedbyanother
TheannualcampaigntomakeSingapore’sthreemillionpeoplemorepoliteendedyesterdayandwasimmediatelyfollowedbyanother
Evidencecameup______specificspeechsoundsarerecognizedbybabiesasyoungas6monthsold.
Scientistssaidtheyhavefoundevidenceofagiantplanetfaroutinoursolarsystem.Inastatement,theCaliforniaInstitute
随机试题
用红花、红曲、香豆、酱黄和青稞面烤成的锅盔和焜锅,外酥内软,香气扑鼻。它是()地区最有名的风味小吃。
苏某系某市制药厂的职工,受该厂委托去某限价区收购当地农民采挖的麻黄草,收购后苏某雇佣了个体运输户陈某的汽车,将麻黄草运往所属的制药厂。在运输途中,被该县草原监理所工作人员发现,经检查,苏某、陈某并未持有采药许可证及调运、货运的合法批准手续,该县草原监理所遂
集体合同的萌芽是出现在()
在Windows7中,为了终止一个应用程序的运行,可以先单击该应用程序窗口中的控制菜单按钮,然后在控制菜单中单击“关闭”按钮。()
男性病人,65岁。有慢性便秘多年。近半年来发现,站立时阴囊部位出现肿块,呈梨形;平卧时可还纳。体检发现外环扩大,压迫内环,嘱病人咳嗽指尖有冲击感,平卧回纳肿块后,手指压迫内环处,站立咳嗽,肿块不再出现。术后预防阴囊血肿的主要护理措施是( )。
个体根据家庭、社会的期望和要求而行事,不考虑行为所产生的直接和明显的后果。这属于道德的()水平。
A.inthefutureB.noxiousC.demandsD.intensifiedPhrases:A.Waterproblems【T13】______willbecomemoreintensean
患者,男性,25岁。口腔溃疡反复发作5年就诊。每月例假前1周口内开始出现溃疡,疼痛明显约1周后疼痛减轻,10~14天自己愈合。检查发现舌背、唇、颊黏膜各有3~5mm直径的溃疡1个,圆形,周围红晕明显。应诊断为()。
简述汉朝的刑罚适用原则。
TheCaffeineHabitTherearemorethan170milliondrugaddictsintheU.S.,andthestrangethingisthatyoucanbecoun
最新回复
(
0
)