What is the common ancestor of humancows and lizard?

The common ancestor of humans, cows, and lizards is a vertebrate that lived over 300 million years ago during the Carboniferous period. This ancestor would have been a primitive amniote, a group of tetrapods that eventually gave rise to mammals, birds, and reptiles. Over time, these lineages diverged, leading to the distinct evolutionary paths that resulted in modern humans, cows, and lizards.