all the animals to the right of the salamander would have the common characteristic of...\njaws\nlungs\nclaws…

Brief Explanations:

The image shows a cladogram, which is a diagram used in biology to show evolutionary relationships among groups of organisms. In a cladogram, a shared derived characteristic is marked on the main branch; every organism branching off to the right of that mark possesses that specific trait. According to the standard vertebrate cladogram depicted, the salamander is an amphibian that possesses lungs but lacks an amniotic egg. The trait that appears immediately to the right of the salamander's branch point—and is therefore shared by all animals to its right (such as lizards, pigeons, mice, and chimps)—is the development of "Claws or nails" (associated with the amniotic clade).

Answer:

Claws or nails