The diagram illustrates the life cycle of a frog, beginning with eggs and ending with the adult stage.
Overall, there are seven main stages in the development of a frog. The process shows a gradual transformation from a fully aquatic creature to an amphibian capable of living on land. One notable feature is the progressive development of legs and lungs, which allows the frog to transition from water to land.
The life cycle starts with eggs, which are laid in clusters in water. These eggs hatch into embryos, which then develop into tadpoles. Initially, tadpoles are fully aquatic, breathing through gills and having a tail for swimming. As they grow, their back legs appear first, followed by the front legs. At this point, the tadpole begins to develop lungs and can start breathing air, marking the transition to a froglet. The froglet still has a small tail, which gradually disappears as it matures. Finally, the frog reaches adulthood, becoming fully capable of living on land.