Answer:
| Class Pisces | Class Reptiles |
|---|---|
| Aquatic (freshwater or marine). | Mostly terrestrial; some live in water (crawling animals). |
| Respiration by gills. | Respiration by lungs. |
| Body covered with scales; has fins for swimming. | Skin dry and covered with horny scales; limbs present (absent in snakes). |
| Heart two-chambered. | Heart three-chambered (four-chambered in crocodile). |
| e.g. Rohu, shark. | e.g. lizard, snake, tortoise. |