The diagram illustrates the different stages that a frog passes through in its lifetime.
Overall, the life cycle of the frog consists of eight main stages, including adult frogs mating first, then laying eggs in the water from which tadpoles emerge. Tadpoles then pass through a number of stages before becoming a froglet, young frog and finally an adult frog, and the entire cycle is repeated all over again.
The life cycle begins when two adult frogs mate and the female frog lays eggs in the water, which is called frogspawn. Seven to ten days later, tadpoles emerge from the eggs and become able to swim and eat algae for food. Then, six weeks later, they develop into bigger tadpoles with back legs. After that, nine weeks later, they are able to swim with both back and front legs.
Twelve weeks after all tadpole stages, it becomes a froglet with a fully pulmonary breathing process in order to leave water and breathe air on land. Additionally, it has a shorter tail than in the first tadpole stages. Over time, it transforms into a young frog and, four years later, it is an adult frog starting to repeat the whole cycle again.