Why do scientists classify fishamphibiansreptilesbirds and mammals together in one group?

Scientists classify fish, amphibians, reptiles, birds, and mammals together in the group called "vertebrates" because they all share a backbone or spinal column. This classification is based on common anatomical features and evolutionary history, indicating that these diverse animal groups share a common ancestor. By grouping them together, scientists can study their similarities and differences more effectively, enhancing our understanding of their Biology and evolution.