Because these structures can be traced back through the ancestors, they essentially serve as a marker of evolution; no organism can have a vestigial organ that hasn't been found in its forefathers.

由于这些结构的出现可以追溯到各代祖先，所以它们可以作为进化的标志；没有一个生物体身上的退化器官是祖先没有的。

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Because these structures can be traced back through the ancestors, they essentially serve as a marker of evolution; no organism can have a vestigial organ that hasn't been found in its forefathers.

由于这些结构的出现可以追溯到各代祖先，所以它们可以作为进化的标志；没有一个生物体身上的退化器官是祖先没有的。

youdao