If frogs are the most durable species of cold-blooded vertebrates and breathe with gills as larvae and lungs as adults, then what is the most durable species that breathes with gills as larvae and lungs as adults?

Answer choices:
- Snakes
 - Salamanders
 - edible
 - salmon
 - Oak
 - Frogs
 - Lizards
 - a fish

 

      Frogs    