Do you know that tadpoles tails disappear? Well let me tell you the four stages it start as a little egg sticky with jelly so it protects it. Then the tadpole turns into a froglet, and finally it a adult.
The four stages in the life cycle start a egg or you call it a spawn. After day It turns into a tadpole all tadpole has tail and gills it need gills so it can breathe.
Then it turn into a froglet but it still needs it’s tail because it not a big frog.
Now its a big adult frog and it doesn't need its tail and it now can live on land.