Question: We know that the development genes that control the vertebrate limb are homologous. This means that the genes that determine how your limb develops are the same genes that determine how a chicken's limb develops, a frog's limb develops, or a whale's limb develops. All three groups of marine mammals share similar changes in their forelimb development that result in the formation of flippers. How can the aquatic lifestyle and related characteristics like the flipper exemplify convergent evolution and homology?