(1) Frogs change as they grow. (2) They begin as eggs. (3) A frog egg looks like a tiny black dot in jelly. (4) In time, a frog egg changes into a tadpole. (5) A tadpole has a tail. (6) It breathes underwater and has gills like a fish. (7) Later, the tadpole develops legs and its tail gets shorter. (8) It grows lungs to replace its gills. (9) The tadpole is now a frog that can live on land!