A chemical formula contains information on the types and spatial arrangement of bonds in the chemical. It also tells you what elements are in the chemical, and how many atoms of each. The spatial arrangement is not necessarily very obvious from the formula, e.g. C2H5OH does not tell you much about the spatial arrangement of the bonds. A chemical formula contains information on the types and spatial arrangement of bonds in the chemical.
All modern amphibians are included in the subclass Lissamphibia, which is usually considered a clade, a group of species that have evolved from a common ancestor. The three modern orders are Anura (the frogs and toads), Caudata (or Urodela, the salamanders), and Gymnophiona (or Apoda, the caecilians).
Most amphibians also have four limbs. Limbs and lungs  are adaptations for life on land; the limbs evolved from the  ancestral fishes' lobed fins. The scales and amenity egg evolved by  reptiles are further adaptations for life on land and distinguish  reptiles from amphibians.he skin in the mouth of some amphibians works the same way as their skin and allows them to respire (You can see this when they allow air flow-it looks like they're breathing normally but in their throat). Long powerful legs that allow it to jump and swim very well.