Give the characteristics of the following with examples :
Class Amphibia

Explanation

(i)These animals are strictly aquatic during larval life and perform only aquatic respiration, whereas they can live in water as well as on land during adult life and can perform aquatic as well as aerial respiration.
(ii) They have two pairs of appendages. Digits are without claws.
(iii) Exoskeleton is absent. Skin is without any derivative (appendages) and is always kept moist for respiration.
(iv) External ear is present.
(v) Neck is absent. Eyes are prominent with eye lids. e.g. Frog, Toad, Salamander, etc.