What derived character is shared by lizards and wolves but not frogs?

The derived character shared by lizards and wolves, but not frogs, is the presence of amniotic eggs. Amniotic eggs have a protective shell and membranes that allow for development in a terrestrial environment, which is a key adaptation for life on land. Frogs, on the other hand, lay eggs in water and do not have this characteristic. This adaptation reflects the evolutionary divergence of amphibians from reptiles and mammals.