The first to evolve is the bony fish which evolved from a jawless fish. The amphibians evolved next after fish. The first amphibians evolved from a lobe-finned fish ancestor about 365 million years ago. They were the first vertebrates to live on land, but they had to return to water to reproduce. For this reason, they had to live near water bodies. They had few characteristics of fish in their early life. The reptiles evolved from the amphibians. They lived completely on land. They laid amniotic eggs and had fertilization. They were the first vertebrates that didn't have to return to water for reproduction. Reptiles developed certain added features such as feathers, hollow bones, and warm bodies. These animals were called birds or Aves. Then mammals.
Note: Mammals and birds both evolved from reptiles-like ancestors.
Contributions ({{ comment_count }})
Please wait...
Modal title
Report
Block User
{{ feedback_modal_data.title }}