The picture shows how frog can grow with process that people call life cycle of a frog.
In general, frogs can live in water and land. So, we can make two groups how life cycle of frogs.
Firstly, frogs can spend much time in their life in water because frogs are special animal. They can breathe in the water. Their childhood from eggs to tadpole until tadpole has front legs break through, they must life in the water because they do not have foot. So, they use tail to swim in the water.
Secondly, when frogs start pulmary breathing until adult frog, they can go to land because they already to start their journey in the land. They have foot to walk and to find food in the land.
To sum up, life cycle of a frog is started from many steps, from eggs to adult frog they undergo many changes.