The upcoming discussion will update you about the differences between Fishes and Tetrapoda.
Difference # Fishes:
1. Fishes have paired appendages in the form of pectoral and pelvic fins.
2. Fishes respire by means of gills.
3. Except lung fishes they do not have internal nares.
4. Heart is 2 chambered except lung fishes where heart is 3 chambered.
5. Fishes have internal ear.
Difference # Tetrapoda:
1. Tetrapods have paired appendages in the form of limbs.
2. Tetrapods respire by lungs. Some amphibians also respire by buccopharyngeal cavity, skin and gills.
3. They have internal nares.
4. Heart is three or four chambered.
5. Tetrapods may have internal and middle ear or internal, middle and external ear. Snakes do not have ears.