what is similar and different about the three forelimbs ? How does this information provide evidence of common ancestry?

Homology, in biology, similarity of the structure, physiology, or development of different species of organisms based upon their descent from a common evolutionary ancestor. 

c. movement because i took the test and it lets me review my answers

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.