为什么鹦鹉螺可以数亿年来没有太大的外观上的变化?这是非常特例的情况吗?还是有很多类似的例子? 知乎 Template




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tomski为什么鹦鹉螺可以数亿年来没有太大的外观上的变化?这是非常特例的情况吗?还是有很多类似的例子? 知乎 coloring