What is the evidence for the origins of mammals from ancient animals?

First of all, genetic research. Thanks to genetics, it was possible to establish and prove the evolution of animals and the connection of many species. Genetics is a very precise and relatively new science, but it was genetics that put the fat point on the issue of the evolution of living things and the origin of humans. Another proof of the origin of mammals from ancient animals is archaeological finds of fossils, where it is clearly possible to trace the development of animals. Also – experiments with wall lizards have confirmed and shown in practice the evolution of living things.