The diagram illustrates the life cycle of a frog, showcasing the stages from the fertilized egg to a fully developed amphibian. Initially, the cycle begins with the eggs, which are laid in water and protected by a jelly-like coating. These eggs eventually develop into embryos. Once this phase is complete, the embryos transform into tadpoles, which cling to water plants for support.
Subsequently, as the tadpoles mature, they develop external gills for respiration, allowing them to breathe underwater. During this period, their tails continue to grow, aiding in their swimming abilities. As the tadpole progresses through its development, hindlegs begin to form, marking the next significant phase in its growth.
Following this, the front legs start to appear, and the tadpole begins to rely on food stored in its tail. Gradually, the tail shortens, and the tadpole undergoes further transformation. Eventually, the tadpole turns into a young frog, at which point most of its tail has disappeared, and it now possesses fully functional limbs for movement both on land and in water.
Finally, in the last stage of this life cycle, the frog reaches adulthood, capable of living independently and reproducing, thus restarting the cycle once again.