不管它们的分化程度有多高,它们都没有,也不可能上升到更高的等级。从有限的水域来到无限的空气中的过程,对进一步的进化十分重要,但这同时也是生物进化中面临的最大危机之一。就在古纳尔·赛弗索德伯格首先在格陵兰的岩石中找到鱼石螈的骨头化石时,其他的科学家也开始探索是什么样的环境迫使四足动物必须登陆。这个问题的提出是自然而然的,因为它的答案将会揭示我们人类祖先的秘密。但是,当时的古生物学家 Regardless of how highly differentiated they are, neither can they rise to a higher level. The process of reaching infinite air from a limited water area is crucial to further evolution, but it is also one of the biggest crises in the evolution of biology. Just as Gunnar Sephor Soderberg first found the bony fossils of the fish in Greenland’s rocks, other scientists are also beginning to explore what kind of environment forces the quadrupeds to land. The formulation of this question is a natural one, for its answer will reveal the secrets of our human ancestry. However, paleontologists at the time