缩减 reduction

互联网2013-11-15

505

　　G ． R． De Beer提出的进化形式之一。青蛙的尾或某种蜥蜴的后肢在幼期时存在，待至成体时则消失或成为痕迹。这显示着从祖先到后代的进化过程。

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