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：2025/11/26
vestigial structure
（ plural ）
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(evolutionary theory) A structure in an organism that has lost all or most of its original function in the course of evolution, such as human appendixes.
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vestigial structure
A whale's pelvic bone is a vestigial structure that hints at its land-dwelling ancestors.
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A whale's pelvic bone is a vestigial structure that hints at its land-dwelling ancestors.
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