I gave an example of one of those dead ends in evolution, which are denied by Creationists. Another example for such dead ends in evolution is leaving the water for living on land. (Why is describing this so difficult? Can’t you simply adopt the word Landgang from German?) Since animals live on land, they always try to go back to live in the water. Batrachians live in the water while in their juvenile stage, but on land in their adult stage. So the Axolotl stays in its juvenile form and never leaves the water. Other batrachians, clawed frogs as well as hellbenders, manage to continue to live in the water, although they become adults at least partially. Some snakes returned into the water. Some turtles have only kept the habit to hide their eggs on land, but live in the water. Already among the dinosaurs had some species returned to the water, became ichthyosaurs and reached such sizes and masses that they were no longer able to live on land. Among the mammals developed whales in the same way. So whales again are the best example for a dead end in evolution. Some other mammals and the penguins among the birds spend parts of their lives under water. Even seaweed isn’t an alga, but a plant species, that returned to the water.

A recent finding in geology is that the continents didn’t exist before life, but rose out of the oceans while life already existed in the oceans. Biologists didn’t acknowledge this new finding enough yet. It shines some light on how living on land became part of the evolution. The continents rose and several individuals must have found themselves trapped on land then. These individuals were suddenly confronted with the problem to avoid drying-up and die of this. Hence all individuals trapped on land had to find either a way back into the ocean or a way into other waters or other means for staying wet and at least avoiding the devastating sunshine. I presume that living on land isn’t just a bad idea and hence a dead end in evolution, but all living beings still feel some of the impetus to flee into the water and this was a driving force in the development of some species.