Many millions of yeas later, the first small _appear on the _ of the water. They _ and filled the _with _, which _ the development of _. Then, _ began to grow on land. They were followed _ by land animal such as _, _. Later _ appeared for the first time when the plants grew into forests. The dinosaurs, the most important reptiles, _ eggs and _ on the earth for a long time but became _ at last, which made the _ of mammal possible. It is because that mammals, who _ their babies, _ when the huge an
