Amphibians
(i) They possess duel life as they can live in aquatic as terrestrial habitat. They are ectothermic (cold blooded).
(ii) They are tetrapods (4 limbs) which facilitate movement land.
(iii) Their limbs are evolved from the pectoral and pelvic fins.
(iv) Their limbs are evolved by mucus and mostly remain moist, also serves as an accessory source oxygen.
(v) They are both gill and lung breathers, usually gills appear in th larval stage, replaced by lungs in the adults stage.
(vi) They possess three chambered heart with two atria and one ventricle.
(vii) The fertilisation is mostly external, females are oviparous.
(viii) Larva is a tadpole, which metamorphosis into adult thus shaving metamorphosis. e.g., Rana frog, Nectureus (mud puppy), Salamandera (salamandes).
Reptiles
(i) In reptiles, creeping and crawling mode of locomotion is found.
(ii) They are mostly terrestrial animals and their body is covered by dry, and cornified skin, epidermal scales or scutes.
(iii) Lungs are well developed and present in all stages of life.
(iv) Toes possess claws.
(v) Appendages are well adapted for the movement on land.
(vi) Heart possesses a partially divided ventricle and 2 atria,
(vii) They lay ammniotic eggs which are incubate on land.
(viii) They are poikilothermic or cold blooded animals. Temperature is regulated mechanically and not metabolically by moving in and out, heat source is usually the sun.
fertilisation is internal They are oviparous and developmant of young oned is direc. e.g., Chelone (turtle), Naja (cobra), Crocodicus (crocodile).
