首页
登录
职称英语
Scientists have determined that Archaeopteryx, the earliest known bird, was
Scientists have determined that Archaeopteryx, the earliest known bird, was
游客
2024-09-29
1
管理
问题
Scientists have determined that Archaeopteryx, the earliest known bird, was definitely birdbrained, meaning no disrespect. Indeed, they consider the fossil’s brain size decisive evidence that Archaeopteryx had what it took to fly.
The new research suggests, moreover, mat birds probably started flying millions of years earlier than scientists previously thought. It is just mat fossils of those first flying birds—predecessors of Archaeopteryx—have never been found.
The researchers, at the Natural History Museum in London, based their findings on the first X-ray examination and reconstruction of the braincase and inner ear of a 147-million-year-old Archaeopteryx specimen.
They found that in size, shape and volume, its brain was similar to that of the modern eagle or sparrow.
Measurements of the semicircular canals, the mechanism for balance inside the ear, showed that Archaeopteryx had the "neurological and structural adaptations necessary for flight," the scientists concluded.
Their research, involving an X-ray computed tomography scan, or C.T., of the fossil’s braincase and inner ear, is described today in the journal Nature.
Previous studies of the feathered wing and tail of Archaeopteryx and its birdlike anatomy, including a pronounced wishbone, supported the prevailing view of experts that it was capable of some degree of powered flight. Archaeopteryx is considered a prime transitional species in the evolution of some reptiles, probably dinosaurs, into today’s birds.
But the research team, led by Dr. Angela Milner, a paleontologist at the British museum, wrote that until their investigation of Archaeopteryx, "little was understood about the extent to which its brain and special senses were adapted for flight."
Dr. Milner said the new study not only established that Archaeopteryx was capable of "controlling the complex business of flying," but also showed "how much there is still to discover about when and how bird flight began."
In a statement issued by the museum, Dr. Milner said, "If flight was this advanced by the time Archaeopteryx was around, then were birds actually flying millions of years earlier than we’d previously thought?" [br] The reason why there still needs improvement in the past view of Archaeopteryx is that
选项
A、fossils of those earliest birds haven’t been discovered yet.
B、the wishbone they studied is just so-called wishbone.
C、there was no study of the role of its brain and some faculties in flight.
D、Archaeopteryx is regarded as the earliest known bird.
答案
C
解析
根据文章第7段可知过去并没有对始祖鸟的脑及其他一些感觉功能进行研究,所以,在这些方面还有待进一步的提高。因此,C为正确选项。
转载请注明原文地址:https://tihaiku.com/zcyy/3779884.html
相关试题推荐
Veryfewscientists_________completelynewanswerstotheworld’sproblems.A、c
ScientistshavedeterminedthatArchaeopteryx,theearliestknownbird,was
ScientistshavedeterminedthatArchaeopteryx,theearliestknownbird,was
ScientistshavedeterminedthatArchaeopteryx,theearliestknownbird,was
ScientistshavedeterminedthatArchaeopteryx,theearliestknownbird,was
Chemists,physicistsandmathematiciansare______knownasscientists.A、alterna
The"cloak"scientistshaveinvented[originaltext](26)Scientistshavecrea
Onethousand______scientistshavesignedthedeclarationsupportingresponsible
The"cloak"scientistshaveinvented[originaltext]Scientistshavecreatedt
Whatconclusioncanbedrawnfromthescientists’observation?[br][originalte
随机试题
Retiredpeoplemayfeellonelyforbeingawayfromtheirformerworkandcolleag
WhohiresHuchangchun?______.[br]Whattypeofcontractisthis?______.
RobertSpring,a19thcenturyforger(伪造者),wassogoodathisprofessionthath
Whencouplesgetmarried,theyusuallyplantohavechildren.Sometimeshowe
患者,男,48岁,因感冒自服退热药2天,4小时前因呕血来诊。急诊胃镜,胃黏膜多发
湿邪为病,多为()A.感而即发 B.伏而后发 C.徐发 D.继发
从道德认识到道德行为,再到( ),是学生思想品德形成的全过程。A.道德标准 B
大多数独生子女都有以自我为中心的倾向。有些非独生子女同样有以自我为中心的倾向。自
给定的图形是纸盒的外边面展开图,下列四个选项是由其折叠的是: A.如上图所示
在行政程序的划分中,按照适用于不同行政职能为标准划分的是( )。A.事前行政程
最新回复
(
0
)