A mother frog lays her eggs on a leafabove water. Soon baby frogs begin to moveinside the eggs. Then the babies, called tadpoles(蝌蚪), go out of the eggs and drop into water.They live and grow in the water. After about 75days, the tadpoles have become frogs. The frogscome out of...
So it can breathe under water.When it becomes a frog,it doesn't have the gill and the tail.Then it has legs for walking on land. Most amphibians can both walk on land and swim in water. ( )51.Which of the following is the smallest? A.Fish. B.Sharks.C.Protozoa. D.Tadpoles. (...