Keywords amphibians, evolution, Devonian period, fish-like ancestors, adaptation, life cycle, thyroid gland, larvae, bony fins, three-chambered heart More for You Judge says dismantling of USAID ...

At that time, known as the Devonian period, the world was changing dramatically ... They were called "lobe-fins," with fins that looked like fleshy paddles, and they had lungs as well as gills.