Earth history; Devonian
In the Devonian, trees grew on the heights around low-lying swamp areas. Many of the plants developed seeds which could be dispersed by the wind. The road to dry land went from the sea through rivers and lakes, where the fishes could benefit from the plant remains washed out from the dry land. The vertebrates adjustment to life on land went slowly. The first terrestrial vertebrates were amphibians, but they looked more like crocodiles. Many were more than one metre long, with a large chest and a robust skeleton. These amphibians had legs and lungs developed from the fishes fins and swim-bladder. Their large teeth were used to catch fishes.
Publisert 18. mai 2011 16:00