As in the metamorphosis of butterflies and all living things that metamorphose the first phase is the egg. When the fertilization season, the female frog will release a lot of eggs in the water. Afterwards the male frog will fertilize the egg. This is called external fertilization (external fertilization). This external fertilization is very vulnerable to failure. Many factors that influence such a strong water flow, the presence of predators in the form of fish. and other disturbances. Frog eggs are often found in a group situation, they are united by a kind of jelly that protects the egg. For tree frogs generally they lay eggs on tree branches. The outer shape resembles a foam to protect the egg from the sun's heat. Frog eggs will hatch into larvae after 21 days.
2.phase of tadpole frog
The tadpoles or tadpoles of frogs will be around the eggs to eat the remains of the food from the shell until the body functions grow and allow to feed themselves. Tadpoles frog will perform the formation of gill organs, tail and mouth until the body is perfectly formed. Until the age of one week tadpole organ has been formed perfectly and ready to feed themselves. At first tadpoles gills are on the surface of the skin. When it reaches the age of 4 weeks the gills will be covered by the skin so the gills will enter the body and disappear slowly. For 6 weeks, in the process of metamorphosis of frogs, tadpoles will continue to change the physiological functions of animals and their morphological form. Her hind legs began to grow and then followed the growth of the forelegs. Likewise the internal organs, lungs began to develop before finally go to the next stage. Young frog. In the period of 6 weeks to 9 weeks will begin to look form of head and body slowly began to elongate. Tadpole food at this time in the form of dead insects found in the waters.
3.phase of the young frog
This phase begins at week 12. After experiencing the growth process, tadpoles begin to experience a growth phase. Changes in shape, gills disappear, frog's tail shortened, mouth widened, and newly formed lungs began to function. Young frogs have begun to engage in the mainland and begin to leave the waters. In addition, the frog digestive system will be adapted to become carnivores, insectivorous eaters. In this phase only lasts for about 3 weeks, until the perfect young frog becomes an adult frog.
4.final phase
At week 16. Frogs are fully formed, adult frogs no longer have gills and changed into lungs. The shape was much different from velvet. Also no longer have a tail. Adult frogs have strong, webbed legs between each finger. Adult frogs no longer live in water. They will only go to the waters during conception. And then again the recycling process of frogs.
