Amphibia:
1. Amphibians can inhabit both land and water. They can survive on both environments by breathing there.
2. The exoskeleton is absent in amphibians. The skin is soft, slimy and moist.
3. Body is divided into head and trunk. Neck is absent.
4. The digits do not have claws.
5. The respiration is by skin when in water and by lungs when on land. The larvae breathe by gills.
6. There is external fertilization at the time of sexual reproduction.
7. The developmental stages are eggs and tadpole. Metamorphosis is seen in amphibians.
8. Examples : Frog, Toad, Salamander, etc.
Reptilia:
1. Reptilians are terrestrial animals. Though turtle and sea snakes can stay in water, they cannot breathe in water.
2. The exoskeleton in the form of scales. Some animals have plates or scutes (e.g. tortoise and crocodile).
3. Body is divided into head, neck and trunk.
4. The digits have claws.
5. The respiration is only by lungs.
6. There is internal fertilization at the time of sexual reproduction.
7. The developmental stages are eggs and juvenile. Metamorphosis is not seen in reptiles.
8. Examples : Tortoise, Lizard, Snake, etc.
