1. The skin is glabrous, glandular, moist and non-scaly which is conducive to both aquatic and terrestrial environments.
2. Respires by gills and complete lungs in the larval stage. Therefore the first stage of life can easily live in water and the full stage in water.
3. Contains paired carotid nerves that transport impulses.
4. The heart has three chambers, two atria and one ventricle. In the process of evolution, Nilaya bifurcation will be divided into four chambers.
5. The eye has three lobes. It protects the eyes.
6. 4 fingers on the front foot and 5 on the back foot. Movement is easy because of fingers.
7. Cold-blooded or ectothermic animals. When the heart becomes four-chambered, they become hyper-blooded or endothermic animals.
8. The life cycle of the tadpole consists of lava stages. The first stage lives in water and the adult stage lives on land. That is, living a double life.