Most amphibians breathe with gills as larvae and with lungs as adults.
Frogs are the most durable of the amphibians.
Frogs are the most durable species of cold-blooded vertebrates and breathe with gills as larvae and lungs as adults.
What is the most durable species that breathes with gills as larvae and lungs as adults?
Options:
1. Snakes
2. Salamanders
3. edible
4. salmon
5. Oak
6. Frogs
7. Lizards
8. a fish