In Amphibia:
| I: | Skin is moist without scales |
| II: | A tympanum represents the ear |
| III: | Fertilization is external |
| 1. | Only I and II are correct | 2. | Only I and III are correct |
| 3. | Only II and III are correct | 4. | I, II, and III are correct |
| 1. | Most have two pairs of limbs and tail is present in some. |
| 2. | Alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca which opens to the exterior. |
| 3. | Respiration is by gills, lungs and through skin. |
| 4. | The heart is two chambered with one atrium and one ventricle. |