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单词 vestigial structure
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Examples ofvestigial structure

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Widely regarded as a nonfunctional, evolutionaryvestigialstructure, it has received little attention compared with motile cilia in organs such as the lung and brain.
From theCambridge English Corpus
Although structures called "vestigial" often appear functionless, avestigialstructuremay retain lesser functions or develop minor new ones.
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In many circumstances, the apparentlyvestigialstructuremay retain a limited functionality, or may be co-opted for other advantageous traits in a phenomenon known as preadaptation.
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The vestigial versions of the structure can be compared to the original version of the structure in other species in order to determine the homology of avestigialstructure.
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However, vestigial structures may have their original function replaced with another.
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In many insects they simply may be functionless vestigial structures.
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Therefore, vestigial structures can be considered evidence for evolution, the process by which beneficial heritable traits arise in populations over an extended period of time.
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Vestigial structures and comparisons in embryonic development are largely a contributing factor in anatomical resemblance in concordance with common descent.
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During evolution, some structures may lose their original function and become vestigial structures.
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Such vestigial structures typically are degenerate, atrophied, or rudimentary, and tend to be much more variable than homologous non-vestigial parts.
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Vestigial structures are often called "vestigial organs", although many of them are not actually organs.
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They were once thought of as vestigial structures that served no real purpose.
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These undeveloped muscles are vestigial structures.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.

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更新时间:2024/12/28 13:10:56