Which one of the following statements about the Class Amphibia is/are correct or incorrect?
(i) The body is divided into two parts: the head and the trunk. In some amphibians, the tail is present.
(ii) Perform respiration through the gills, lungs, and skin.
(iii) All members have scales.
(iv) They are adapted to live both on land and in water

Amphibians are vertebrates. They have a body that is divided into two parts: a head and a trunk, with some amphibians having a tail. These organisms when in water breathe using their gills, but on land, they breathe through their lungs or moist skin. As a result, amphibians are adapted to live both on land and in water. 

Most amphibians have smooth and moist skin devoid of scales except Apoda (caecilians) which have scales.