The diagram illustrates the different stages involved in the life of a frog. Overall, frogs have to go through several life phases, starting from eggs, turning into embryos which later develop into tadpoles and then adult frogs.
First of all, eggs are laid in the pond. These eggs are later hatched and turned into embryos. Afterwards, the embryo passes through several changes in the length of the body before becoming a tadpole. The tadpole is longer in length than the embryos, and after some time, the front legs will break through.
The next phase is the start of pulmonary breathing, which is the ability to breathe both inside and outside the water. Once it has the ability to breathe outside the water, it transforms into a tadpole frog that has a shorter tail than it had in previous phases. At the end of the phase, an adult frog emerges, and the life cycle starts again.