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).
The first vertebrates to come onto land were fish-like animals that developed lungs and could thus stay on land for extended periods.These evolved into terrestrial amphibians â¦ (although many amphibians require water in which to lay eggs, and some are aquatic).+ 6 others found this useful.he group of  vertebrates that are terrestrial (land-dwelling) â¦ are called  tetrapods. The first tetrapods evolved in the late Devonian. They  were amphibious creatures that spent part of their lives in water.