You are presented with the quiz "what breathe with gills as larvae and lungs as adults?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "most amphibians breathe with gills as larvae and with lungs as adults" and "frogs are amphibians, iguanas and snakes are reptiles". 

So, what's the best answer to the question?


 

   frogs        