The diagram depicts the natural life cycle of a frog. Overall, it is a cyclical process and consists of 3 stages, initiating with the frogspawn and ending with a fully grown amphibian—an adult frog.
In the first stage, a large number of fertilized eggs are laid and float on the surface of the pond. This is followed by the emergence of the baby tadpole, which has a small body and long tail. Gradually, the tadpole body grows bigger while the tail becomes longer. At this point in the cycle, hindlegs appear in order to prepare the tadpole for its future life on land. Eventually, the tadpole starts to transform into a young frog that has front legs, a reduced tail, and bigger hindlimbs.
At this stage, the young frog keeps living in the pond. Thus, its journey on water ends, and ground life begins. As a result of being on land, its tail disappears, and the young frog finally turns into a fully-grown adult frog. The final stage happens when the mating process starts so as to produce newly fertilized eggs. The frog’s life cycle starts again at the same place where it began.