Question:  What were the components of the pectoral girdle in early fishes and how has it changed in tetrapods? Specifically, what is the typical fate of the coracoids and clavicle in the tetrapod girdle?
Question:  What is the function of the pelvic girdle? What are the structural components?
Question: What changes have occurred in the evolution of the pelvic girdle of anurans, birds, mammals?
Question:  What structural modification(s) have taken place in the appendicular skeleton to accommodate the transition from the aquatic to the terrestrial environment?