1·Today, the dinosaurs are extinct long ago, and the king crab after experienced a disaster has miraculously survived, but did not change shape. What is the cause then?
如今恐龙早已灭绝了,而鲎经历了一场场灾难,奇迹般地存活至今,而且形态也没有发生变化,这是什么原因呢?