A characteristic shared by birds, salamanders, and sharks is B. Jaws and paired appendages. Let's go through the process of elimination. Lungs: salamanders and birds have lungs, but sharks have gills. Jaws and paired appendages: birds, salamanders, and sharks have these characteristics. Four limbs: salamanders and birds have four limbs, but sharks have fins. Endothermy: salamanders and birds are endothermic organisms, but sharks are ectothermic.
