The diagram shows the different stages in the life cycle of a frog. Overall, the cycle has four stages and lasts for up to approximately five years, which enables it to leave aquatic environments to move onto land.
The frog begins life as an egg, which is laid in still, shallow waters such as ponds or lakes. The eggs are laid in large quantities and protected in a jelly-like coating. After one to six weeks, the frog hatches into a tadpole which moves like a fish and feeds on algae and small plants in water. During this stage, which lasts for between six and nine weeks, the tadpole develops four small legs.
In the third stage, the frog turns into a froglet, which can jump. In this stage, the froglet develops lungs, enabling it to breathe outside water. It continues to eat algae and small plants for 12 weeks before it matures into an adult frog that do not have a tail. In this final stage, the adult frog changes its diet, feeding on insects and small animals and lives on land and in water. The adult frog remains in this environment for two to four years, before moving to lakes and ponds to lay the eggs of the next generation and beginning the cycle again.