Most scientists believe that there was life in the sea before there was any living on land. The land had no life for the next 160,000,000 years. The strange, fishlike creatures began to came out the oceans on to the land. At the first their movement were very awkward because they had no legs. They to use their fins, which became legs and feet. Which these changes were taking place, the animals still laid their eggs and hatched their young in the water.