Monday, March 8, 2010
Written in the Rocks
On page 49, Jerry Coyne suggests the theory that whales descended from terrestrial animals. He says that the transitional form between the terrestrial and aquatic mammal could possibly be a hippopotamus. Supposedly, this evolutionary sequence occurred after land mammals had evolved from fish, particularly a group of "lobe-finned fishes" as described on page 36. So if humans potentially evolved from aquatic animals (fish), then wouldn't it be contradictory to say that aquatic whales evolved from terrestrial animals? What evidence is there that proves that one event happened before the other or that it was possible to move from water to land and then back to land again?