Amphibia:

1. Their skin is glandular, smooth and moist.

2. Scales are not present in them.

3. Their digits do not possess claws.

4. They have a three-chambered heart.

Example: Frog, toad.

Reptilia:

1. Their skin is non-glandular, dry and keratinised.

2. Horny scales are present over their body surface.

3. Their digits end in claws.

4. Their heart is incompletely four chambered.

Example: Lizard, snake, tortoise, dinosaurs (extinct).