| amphibians respiratory system vs birds | 1.43 | 0.3 | 6424 | 38 | 77 |
| respiratory system of amphibians | 1.31 | 0.5 | 625 | 32 | 51 |
| similarities between amphibians and birds | 1.78 | 0.6 | 3982 | 41 | 37 |
| bird vs mammal respiratory system | 1.31 | 0.7 | 335 | 33 | 43 |
| avian vs mammalian respiratory system | 0.12 | 0.9 | 2503 | 37 | 58 |
| how is a birds respiratory system different | 0.37 | 0.4 | 9169 | 43 | 73 |
| amphibians respiration and circulation | 1.12 | 0.5 | 355 | 38 | 70 |
| is a bird an amphibian | 0.79 | 0.3 | 9618 | 22 | 26 |
| most amphibians breathe air by means of | 0.03 | 0.1 | 2721 | 39 | 69 |
| mammals birds reptiles amphibians | 0.98 | 0.7 | 6406 | 33 | 78 |
| do amphibians breathe with lungs | 1.5 | 0.3 | 4830 | 32 | 86 |
| amphibians breathe with lungs or gills | 1.99 | 0.6 | 1383 | 38 | 52 |
| are birds reptiles or amphibians | 1.41 | 0.5 | 5008 | 32 | 23 |
| do amphibians have lungs | 1.15 | 0.8 | 924 | 24 | 4 |
| how do amphibians respire | 1.61 | 0.6 | 4390 | 25 | 40 |
| discuss how amphibians breathe | 1.51 | 0.3 | 151 | 30 | 24 |
| amphibians respiration through skin | 0.97 | 0.9 | 1472 | 35 | 15 |
| mammal reptile amphibian bird | 1.77 | 0.2 | 1694 | 29 | 9 |
